User:ColorfulGalaxy/Encyclopedia of numbers：修订间差异

2025年4月19日 (六) 18:40的最新版本

This article is inspired by this article, which was biased towards decimal properties and did not mention imaginary numbers. This article, instead, is biased towards septenary and tetradecimal properties, though the numbers are written in decimal. Shidinn-related entries are also welcome.

目录
0	1	2	7	14	49	196	343	2744
Top of page — Legend — See also — External links

Legend

Positive prime numbers

Number (excluding positive prime numbers) whose absolute value is an integer

Number whose absolute value is a rational number that is not integer

Number whose absolute value is an algebraic irrational number

Number whose absolute value is a transcendental real number

Unknown/approximation

Some terms can have subscripts. They indicate which base^[1] the property applies in. For example, "digit₁₄"^[2] is read as "tetradecimal digit".

Numbers

0

... is the smallest non-negative number.
... is the additive identity.

1

... is the smallest positive number.
... is the multiplicative identity.

2

... is the smallest positive prime number.
... is the only even positive prime number.
... is an RDI₇^[3] of order 2.
... is the last distinct digit₇^[2] to encounter when the digits₇ of π are scanned^[4].

3

... is the smallest odd positive prime number.
... is the smallest Full Reptend Prime₁₄^[5].

π

... contains almost everyone's birthday in 6-digit or 8-digit form.
... is the irrational number that we most known.

4

... is the smallest positive composite number.
... is the 2nd square number.
... is the largest known positive integer n such that there exists an arithmetic progression with n terms (all positive, indexed 1 through n) satisfying the fact that the number of positive factors each term has is exactly equal to the term's index.

5

... is the smallest positive odd number that is not a repunit₂^[6] number.
... is the number of Platonic solids.
... is the number of letters in the longest word in Shidinn. There are 278 known five-letter words.
... was the number of members in the Shidinn community administration committee when it started.
... consecutive digits₇^[2] after the point in π are multiples of 3.

6

... is the smallest positive composite number that is not a perfect power.
... is the largest digit₇^[2].
... is the smallest perfect number.
... is the number of known Shidinn characters with numeral sum of exactly 100000.

7

... is the third smallest repunit₂^[6] number.
... is the smallest positive two-digit₇^[2] number.
... is the second smallest positive 1-automorphic₁₄^[7] number.
... is the smallest positive strobogrammatic_xdi8 number.
... is the number of classical elements in Shidinn culture. See Seven elements.
... is the unique positive integer n such that "the smallest integer m such that e^m exceeds nⁿ is exactly equal to 2n".
... is the smallest positive non-unity integer n such that there exists a four-digit_n^[2] repdigit_n^[8] square number.
... is the smallest known positive non-unity integer n such that there exists a three-digit_n^[2] number k=a×n²+b×n+c satisfying that k-1, k and k+1 have a, b and c (i. e. its digits) positive factors respectively.
... is the number that represents God in western culture.

8

... is the smallest positive composite cube number.
... is the smallest positive composite Fibonacci number.
... is the largest cube in the Fibonacci sequence.
... is the second smallest repunit₇^[6] number.
... is the smallest known repfigit₇^[9] number.
... is the third smallest positive 1-automorphic₁₄^[7] number.
... is the second cubic number.

9

... is the smallest positive odd composite number.
... is the second smallest Smarandache₇^[10] number.
... is the smallest positive integer n such that 3ⁿ starts with three identical digits₇^[2].
... is the smallest positive integer n such that nⁿ is pandigital₇^[11].
... is the largest digit in base^[1] 10.

10

... is the smallest positive even number n where n-1 is a Fermat pseudoprime_n^[12].
... is the smallest positive integer that is not a Harshad₇^[13] number.
... is a Narcissistic₇^[14] number.
... is a disarium₇^[15] number.
... is the number of digits₇^[2] after the point to be scanned^[4] in order to get all seven digits₇ from π.
... is the unique positive integer that comes between ${\sqrt {7\times 14}}$ and ${\frac {7+14}{2}}$ .
... is a strobogrammatic_xdi8 number.
... is the number of current members in the Shidinn community administration committee.

11

... is the smallest positive odd prime number that is not palindromic₂^[16].

12

... is the smallest abundant number.
... is the number of two-digit₇^[2] prime numbers.
... is the smallest known positive non-unity integer n such that there exists a five-digit_n^[2] number k=a×n⁴+b×n³+c×n²+d×n+f satisfying that k-2, k-1, k, k+1 and k+2 have a, b, c, d and f (i. e. its digits) positive factors respectively. More surprisingly, that number is a repdigit₁₂^[8] number.
... is the smallest true composite number.

13

... is the number of Archimedean solids.
... is the largest digit₁₄^[2].
... is the third smallest repunit₃^[6] number.
... is an RDI₇^[3] of order 2.
... is the smallest positive odd Fibonacci number that is not palindromic₂^[16].
... is the number that represents Devil in western culture.

14

... is the smallest positive two-digit₁₄^[2] number.
... is the smallest two-digit₇^[2] "kind₇"^[17] number.
... is the smallest integer n such that eⁿ exceeds 7⁷.
... is the index of the nasal sibilant in the Shidinn alphabet.

15

... is the smallest positive odd composite number that is not a perfect power.
... is the second smallest repunit₁₄^[6] number.

16

... is the second smallest positive tesseractic number.
... is the smallest positive integer with five positive factors.
... is a repdigit₇^[8] number.
... is the second smallest Smarandache₁₄^[10] number.
... is the smallest positive composite number whose reversal₁₄^[18] is prime.

17

... is a Fermat prime.
... is the smallest prime number that is the concatenation₇^[19] of two prime numbers.

18

... is the smallest two-digit₁₄^[2] number in the Fibonacci-like sequence starting with 2 and 1.

19

... is the smallest positive odd prime number whose reversal₂^[18] is composite.

20

... is the smallest positive integer n such that 2ⁿ is pandigital₇^[11].
... is the smallest positive non-repdigit₇ integer whose square is repdigit₇^[8].
... is the integer that caused an "e-mail war" between Shidinn enthusiasts on February 24, 2025.

21

... is the sum of all the one-digit₇^[2] numbers. It is also the numbers of dots on the dice used in most of the board games.
... is the third smallest repunit₄^[6] number.
... is the third smallest^{[lɤ ɛyuə iq8 q6]} positive integer whose tesseractic is a happy₁₄^[20] number.

22

23

... is the smallest prime number that is not a twin prime.
... is the smaller prime factor of 2047, the smallest Mersenne composite number.

24

... is the smallest positive integer n such that 2ⁿ ends in three identical digits₇^[2].

25

... is a narcissistic₇^[14] number.
... is an RDI₁₄^[3] of order 2.
... is the smallest positive integer n such that 2ⁿ starts in three identical digits₇^[2] and ends in three identical digits₇.

26

27

28

29

... is the smallest positive odd prime number whose reversal₁₄^[18] is composite.
... is the second smallest two-digit₁₄^[2] number in the Fibonacci-like sequence starting with 2 and 1.
... is a repfigit₁₄^[9] number.

30

... is a repdigit₁₄^[8] number.
... is the number of two-digit₇^[2] composite numbers.
... is a strobogrammatic_xdi8 number.

31

... is a Mersenne prime.
... is the smallest prime number that is the concatenation₁₄^[19] of two prime numbers.
... is the third smallest repunit₅^[6] number.

32

... is a repdigit₇^[8] number.
... is a narcissistic₇^[14] number.
... is the second smallest positive hyperhypercube number.

33

34

... is the smallest known number in a Friedman₁₄ loop^[21]:

2⁶=64

8⁴=4096

6×(12×8-1)=570

2×12+10=34

35

... is in a Friedman₁₄ loop^[21]:

7³=343

(1+10)×7=77

5×7=35

7²=49

36

37

... is an RDI₁₄^[3] of order 2.

38

39

40

... is in a Friedman₁₄ pair^[21]:

12²=144

4×10=40

41

... is the sum of all the one-digit₁₄^[2] prime numbers.

42

... is the number of U. S. states in the fictional Shidinn timeline.
... is the number that was been thought as the truth of the universe.

43

44

45

... is the number of letters in the Shidinn alphabet.
... is a narcissistic₇^[14] number.
... is the third smallest^{[lɤ ɛyuə iq8 q6]} positive integer whose tesseractic is a happy₇^[20] number.

46

47

... is the largest two-digit₇^[2] prime number.
... is the representative prime number of User:Rachel1211.
... is featured on this website. You can submit entries there.

48

... is the largest two-digit₇^[2] number.

49

... is the smallest three-digit₇^[2] number.
... is the sum of all the one-digit₁₄^[2] composite numbers.

50

... is the smallest positive palindromic₇^[16] number that is not repdigit₇^[8].

51

52

53

... is the smallest three-digit₇^[2] prime number.

54

55

... is the second smallest positive integer that is both square pyramidal and triangular, as mentioned by a Shidinn enthusiast.

56

57

... is the third smallest repunit₇^[6] number.
... is the number of distinct symbols in the standard "Spot it" pack, with 8 symbols on each card. (See 73)

58

59

... is the smallest three-digit₇^[2] twin prime.
... is the smallest prime number that can be expressed as 8 times a square number plus 27 times a square number. This property of prime numbers was mentioned by a Shidinn enthusiast as an "unfortunate" property.

60

61

62

63

64

65

..., as 4×14+9, is a Cyclic₁₄ number^[22].

66

... is the third smallest Smarandache₇^[10] number.

67

68

69

70

71

... is the largest known positive integer whose square can be written as one plus the factorial of another positive integer.
... is the smallest positive palindromic₇^[16] prime number that is not repdigit₇^[8].
... is featured on this website. You can submit entries there.

72

... is the smallest positive integer that is not a perfect power but can be written as the product of perfect powers.

73

... is the third smallest repunit₈^[6] number.
... is the third smallest positive integer that is both palindromic₂^[16] and palindromic_b3^[23].
... is the second smallest positive integer that is the sum of three different positive cubic numbers.
... is the sum of the cubes of the three smallest positive palindromic₃^[16] numbers.
... is the smallest non-palindromic₇^[16] positive prime number that ends with two identical digits₇^[2].
... is the number of cards in the Seven elements poker game. The pack has 7 suits of 10 cards each, along with three extra cards (INF, 7UT and blank).
... is the theoretical number of distinct symbols in "Spot it" variant, with 9 symbols (instead of 8) on each card.
... is a number worshipped in Shidinn culture.
... is featured on this website. You can submit entries there.

74

75

76

... is the sum of the first three Smarandache₇^[10] numbers.

77

78

79

80

81

... is the third smallest positive tesseractic number.
... is in the username of User:DGCK81LNN.

82

... is a strobogrammatic_xdi8 number.

83

84

85

... is the largest known index of a square pyramidal number that is also triangular. Its index in the triangular sequence is 645.
... is the smallest positive palindromic₇^[16] semiprime that is not repdigit₇^[8].

86

87

88

89

... is the total number of letters in the Shidinn alphabet and the Extended Shidinn alphabet, including the "number zero" letter.

90

91

... is the sum of all the one-digit₁₄^[2] numbers.
... is the third smallest repunit₉^[6] number.
... is the third smallest positive integer that is both square pyramidal and triangular, as mentioned by a Shidinn enthusiast.

92

93

94

95

96

97

... is the last prime number that 10 ≤ x ≤ 99.

98

99

100

... is the smallest 2-digit₁₀₀ number.

101

102

103

104

105

106

107

108

109

110

111

112

113

114

... is the number that is CURRENTLY thought as the truth of the universe.

115

116

117

118

119

120

121

122

123

124

125

126

127

... is a number worshipped in Shidinn culture.^{[lɤ ɛyuə iq8 q6]}

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

... is the largest two-digit₁₄^[2] prime number.

194

195

... is the largest two-digit₁₄^[2] number.

196

... is the smallest three-digit₁₄^[2] number.

197

... is the smallest three-digit₁₄^[2] prime number.
... is the smallest positive palindromic₁₄^[16] number that is not repdigit₁₄^[8].
... is the smallest positive palindromic₁₄^[16] prime number that is not repdigit₁₄^[8].

198

199

200

201

... is the smallest three-digit₁₄^[2] squarefree^[24] composite number.

202

203

204

205

206

207

208

209

210

211

... is the third smallest repunit₁₄^[6] number.
... is the smallest repunit₁₄^[6] prime number.

212

213

214

215

216

217

218

219

220

221

222

223

224

225

... is the second smallest three-digit₁₄^[2] square number.

226

227

... is the third smallest Smarandache₁₄^[10] number, as well as the smallest Smarandache₁₄ prime number.
... is the second smallest prime number that can be expressed as 8 times a square number plus 27 times a square number. This property of prime numbers was mentioned by a Shidinn enthusiast as an "unfortunate" property.

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

Notes

References

↑ ^1.0 ^1.1 Base on Wolfram Mathwold
↑ ^2.00 ^2.01 ^2.02 ^2.03 ^2.04 ^2.05 ^2.06 ^2.07 ^2.08 ^2.09 ^2.10 ^2.11 ^2.12 ^2.13 ^2.14 ^2.15 ^2.16 ^2.17 ^2.18 ^2.19 ^2.20 ^2.21 ^2.22 ^2.23 ^2.24 ^2.25 ^2.26 ^2.27 ^2.28 ^2.29 ^2.30 ^2.31 ^2.32 ^2.33 ^2.34 Digit on Wolfram Mathworld
↑ ^3.0 ^3.1 ^3.2 ^3.3 Recurring digial invariant on Wolfram Mathworld
↑ ^4.0 ^4.1 Constant digit scanning on Wolfram Mathworld
↑ Full Reptend Prime on Wolfram Mathworld
↑ ^6.00 ^6.01 ^6.02 ^6.03 ^6.04 ^6.05 ^6.06 ^6.07 ^6.08 ^6.09 ^6.10 ^6.11 Repunit on Wolfram Mathworld
↑ ^7.0 ^7.1 Automorphic number on Wolfram Mathworld
↑ ^8.00 ^8.01 ^8.02 ^8.03 ^8.04 ^8.05 ^8.06 ^8.07 ^8.08 ^8.09 ^8.10 Repdigit on Wolfram Mathworld
↑ ^9.0 ^9.1 Repfigit on Wolfram Mathworld
↑ ^10.0 ^10.1 ^10.2 ^10.3 ^10.4 Smarandache number on Wolfram Mathworld
↑ ^11.0 ^11.1 Pandigital on Wolfram Mathworld
↑ Fermat pseudoprime on Wolfram Mathworld
↑ Harshad number on Wolfram Mathworld
↑ ^14.0 ^14.1 ^14.2 ^14.3 Narcissistic number on Wolfram Mathworld
↑ Disarium number on OEIS
↑ ^16.00 ^16.01 ^16.02 ^16.03 ^16.04 ^16.05 ^16.06 ^16.07 ^16.08 ^16.09 Palindromic on Wolfram Mathworld
↑ "Kind" number on OEIS
↑ ^18.0 ^18.1 ^18.2 Reversal on Wolfram Mathworld
↑ ^19.0 ^19.1 Concatenation on Wolfram Mathworld
↑ ^20.0 ^20.1 Happy number on Wolfram Mathworld
↑ ^21.0 ^21.1 ^21.2 Anti-Friedman number, Shifted Friedman number, Friedman pair, Friedman loop
↑ Cyclic number on Wolfram Mathworld
↑ Balanced ternary on Simple Wikipedia
↑ Squarefree number on Wolfram Mathworld

External links

Numbers on Archimedes Lab

[base-1] 1.0 ^1.1 Base on Wolfram Mathwold

[digit-2] 2.00 ^2.01 ^2.02 ^2.03 ^2.04 ^2.05 ^2.06 ^2.07 ^2.08 ^2.09 ^2.10 ^2.11 ^2.12 ^2.13 ^2.14 ^2.15 ^2.16 ^2.17 ^2.18 ^2.19 ^2.20 ^2.21 ^2.22 ^2.23 ^2.24 ^2.25 ^2.26 ^2.27 ^2.28 ^2.29 ^2.30 ^2.31 ^2.32 ^2.33 ^2.34 Digit on Wolfram Mathworld

[rdi-3] 3.0 ^3.1 ^3.2 ^3.3 Recurring digial invariant on Wolfram Mathworld

[constantdigitscanning-4] 4.0 ^4.1 Constant digit scanning on Wolfram Mathworld

[frp-5] Full Reptend Prime on Wolfram Mathworld

[repunit-6] 6.00 ^6.01 ^6.02 ^6.03 ^6.04 ^6.05 ^6.06 ^6.07 ^6.08 ^6.09 ^6.10 ^6.11 Repunit on Wolfram Mathworld

[automorphic-7] 7.0 ^7.1 Automorphic number on Wolfram Mathworld

[repdigit-8] 8.00 ^8.01 ^8.02 ^8.03 ^8.04 ^8.05 ^8.06 ^8.07 ^8.08 ^8.09 ^8.10 Repdigit on Wolfram Mathworld

[repfigit-9] 9.0 ^9.1 Repfigit on Wolfram Mathworld

[smarandache-10] 10.0 ^10.1 ^10.2 ^10.3 ^10.4 Smarandache number on Wolfram Mathworld

[pandigital-11] 11.0 ^11.1 Pandigital on Wolfram Mathworld

[psp-12] Fermat pseudoprime on Wolfram Mathworld

[harshad-13] Harshad number on Wolfram Mathworld

[narcissistic-14] 14.0 ^14.1 ^14.2 ^14.3 Narcissistic number on Wolfram Mathworld

[disarium-15] Disarium number on OEIS

[palindromic-16] 16.00 ^16.01 ^16.02 ^16.03 ^16.04 ^16.05 ^16.06 ^16.07 ^16.08 ^16.09 Palindromic on Wolfram Mathworld

[a185186-17] "Kind" number on OEIS

[reversal-18] 18.0 ^18.1 ^18.2 Reversal on Wolfram Mathworld

[concatenation-19] 19.0 ^19.1 Concatenation on Wolfram Mathworld

[happy-20] 20.0 ^20.1 Happy number on Wolfram Mathworld

[friedmanpair-21] 21.0 ^21.1 ^21.2 Anti-Friedman number, Shifted Friedman number, Friedman pair, Friedman loop

[cyclic-22] Cyclic number on Wolfram Mathworld

[balancedternary-23] Balanced ternary on Simple Wikipedia

[squarefree-24] Squarefree number on Wolfram Mathworld

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[11]

[12]

[13]

[14]

[15]

[16]

[17]

[18]

[19]

[20]

[21]

[22]

[23]

[24]

@@ 第14行： / 第14行： @@
 <div style="border:2px solid blue;">Positive prime numbers </div>
-<div style="border:2px solid #ff00ff;">Number (excluding positive prime numbers) whose absolute value is an integer</div>
+<div style="border:2px solid magenta;">Number (excluding positive prime numbers) whose absolute value is an integer</div>
 <div style="border:2px solid orange;">Number whose absolute value is a rational number that is not integer</div>
-<div style="border:2px solid #00ffff;">Number whose absolute value is an algebraic irrational number</div>
+<div style="border:2px solid cyan;">Number whose absolute value is an algebraic irrational number</div>
 <div style="border:2px solid green;">Number whose absolute value is a transcendental real number</div>
 <div style="border:2px solid red;">Unknown/approximation</div>
@@ 第41行： / 第41行： @@
 * ... is the only even positive prime number.
 * ... is an RDI<sub>7</sub><ref name="rdi"/> of order 2.
+* ... is the last distinct digit<sub>7</sub><ref name="digit"/> to encounter when the digits<sub>7</sub> of π are scanned<ref name="constantdigitscanning"/>.
 </div>
@@ 第47行： / 第48行： @@
 * ... is the smallest odd positive prime number.
 * ... is the smallest Full Reptend Prime<sub>14</sub><ref name="frp"/>.
+</div>
+===π===
+<div style="border:2px solid green;">
+* ... contains almost everyone's birthday in 6-digit or 8-digit form.
+* ... is the irrational number that we most known.
 </div>
@@ 第62行： / 第69行： @@
 * ... is the number of letters in the longest word in Shidinn. There are 278 known five-letter words.
 * ... was the number of members in the Shidinn community administration committee when it started.
+* ... consecutive digits<sub>7</sub><ref name="digit"/> after the point in π are multiples of 3.
 </div>
@@ 第69行： / 第77行： @@
 * ... is the largest digit<sub>7</sub><ref name="digit"/>.
 * ... is the smallest perfect number.
+* ... is the number of known Shidinn characters with [[希顶解经|numeral sum]] of exactly 100000.
 </div>
@@ 第78行： / 第87行： @@
 * ... is the smallest positive strobogrammatic<sub>[[希顶字母数字|xdi8]]</sub> number.
 * ... is the number of classical elements in Shidinn culture. See [[Seven elements]].
+* ... is the unique positive integer ''n'' such that "the smallest integer ''m'' such that e<sup>''m''</sup> exceeds ''n''<sup>''n''</sup> is exactly equal to 2''n''".
 * ... is the smallest positive non-unity integer ''n'' such that there exists a four-digit<sub>n</sub><ref name="digit"/> repdigit<sub>n</sub><ref name="repdigit"/> square number.
 * ... is the smallest known positive non-unity integer ''n'' such that there exists a three-digit<sub>n</sub><ref name="digit"/> number k=a×n<sup>2</sup>+b×n+c satisfying that k-1, k and k+1 have a, b and c (i. e. its digits) positive factors respectively.
@@ 第109行： / 第119行： @@
 * ... is a Narcissistic<sub>7</sub><ref name="narcissistic"/> number.
 * ... is a disarium<sub>7</sub><ref name="disarium"/> number.
+* ... is the number of digits<sub>7</sub><ref name="digit"/> after the point to be scanned<ref name="constantdigitscanning"/> in order to get all seven digits<sub>7</sub> from π.
+* ... is the unique positive integer that comes between <math>\sqrt{7\times14}</math> and <math>\frac{7+14}{2}</math>.
 * ... is a strobogrammatic<sub>[[希顶字母数字|xdi8]]</sub> number.
 * ... is the number of current members in the Shidinn community administration committee.
@@ 第140行： / 第152行： @@
 * ... is the smallest positive two-digit<sub>14</sub><ref name="digit"/> number.
 * ... is the smallest two-digit<sub>7</sub><ref name="digit"/> "kind<sub>7</sub>"<ref name="a185186"/> number.
+* ... is the smallest integer ''n'' such that e<sup>''n''</sup> exceeds 7<sup>7</sup>.
 * ... is the index of the nasal sibilant in the [[Shidinn alphabet]].
 </div>
@@ 第251行： / 第264行： @@
 * ... is a repdigit<sub>7</sub><ref name="repdigit"/> number.
 * ... is a narcissistic<sub>7</sub><ref name="narcissistic"/> number.
+* ... is the second smallest positive hyperhypercube number.
 </div>
@@ 第311行： / 第325行： @@
 <div style="border:2px solid #ff00ff">
 * ... is the number of U. S. states in the fictional [[希顶世界线|Shidinn timeline]].
+* ... is the number that was been thought as the truth of the universe.
 </div>
@@ 第476行： / 第491行： @@
 * ... is the third smallest repunit<sub>8</sub><ref name="repunit"/> number.
 * ... is the third smallest positive integer that is both palindromic<sub>2</sub><ref name="palindromic"/> and palindromic<sub>b3<ref name="balancedternary"/></sub>.
+* ... is the second smallest positive integer that is the sum of three different positive cubic numbers.
+* ... is the sum of the cubes of the three smallest positive palindromic<sub>3</sub><ref name="palindromic"/> numbers.
+* ... is the smallest non-palindromic<sub>7</sub><ref name="palindromic"/> positive prime number that ends with two identical digits<sub>7</sub><ref name="digit"/>.
 * ... is the number of cards in the [[Seven elements]] poker game. The pack has 7 suits of 10 cards each, along with three extra cards (INF, 7UT and blank).
 * ... is the theoretical number of distinct symbols in "Spot it" variant, with 9 symbols (instead of 8) on each card.
@@ 第541行： / 第559行： @@
 <div style="border:2px solid #ff00ff">
 * ... is the largest known index of a square pyramidal number that is also triangular. Its index in the triangular sequence is 645.
+* ... is the smallest positive palindromic<sub>7</sub><ref name="palindromic"/> semiprime that is not repdigit<sub>7</sub><ref name="repdigit"/>.
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 ===97===
 <div style="border:2px solid blue">
+* ... is the last prime number that 10 ≤ x ≤ 99.
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 ===100===
 <div style="border:2px solid #ff00ff">
+* ... is the smallest 2-digit<sub>100</sub> number.
 </div>
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 ===114===
 <div style="border:2px solid #ff00ff">
+* ... is the number that is CURRENTLY thought as the truth of the universe.
 </div>
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 ==References==
 <references><ref name="base">'''[http://mathworld.wolfram.com/Base.html Base] on Wolfram Mathwold'''</ref><ref name="digit">[http://mathworld.wolfram.com/Digit.html Digit] on Wolfram Mathworld</ref>
+<ref name="constantdigitscanning">[http://mathworld.wolfram.com/ConstantDigitScanning.html Constant digit scanning] on Wolfram Mathworld</ref>
 <ref name="concatenation">[http://mathworld.wolfram.com/Concatenation.html Concatenation] on Wolfram Mathworld</ref>
 <ref name="reversal">[http://mathworld.wolfram.com/Reversal.html Reversal] on Wolfram Mathworld</ref>