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- (A cap C) cup (B cap Complement C) = Empty iff B subset C subset Complement A
- -1
- -1^n by -n choose k-1 equals -1^k by -k choose n-1
- 0
- 0.999...=1
- 0.999...=1/Proof 1
- 0.999...=1/Proof 2
- 0.999...=1/Proof 3
- 0.999...=1/Proof 4
- 0.999...=1/Proof 5
- 0 in B-Algebra is Left Cancellable Element
- 1
- 1+1 = 2
- 1+1 = 2/Proof 1
- 1+1 = 2/Proof 2
- 1+2+...+n+(n-1)+...+1 = n^2
- 1+2+...+n+(n-1)+...+1 = n^2/Illustration
- 1+2+...+n+(n-1)+...+1 = n^2/Proof 1
- 1+2+...+n+(n-1)+...+1 = n^2/Proof 2
- 1+2+...+n+(n-1)+...+1 = n^2/Proof 3
- 1+2+...+n+(n-1)+...+1 = n^2/Proof 4
- 1+2+...+n = n(n+1)/2
- 1+3+...+(2n-1) = n^2
- 1+4+9+...+n^2=n(n+1)(2n+1)/6
- 1+4+9+...+n^2 = n(n+1)(2n+1)/6
- 1+8+27+...+n^3 = n^2(n+1)^2/4
- 1,000,000
- 1,000,000,000,061
- 1,000,000,000,063
- 1,002,000,000,000
- 1,002,000,000,000/Historical Note
- 1,003,003,001
- 1,026,753,849
- 1,030,301
- 1,031,223,314
- 1,048,576
- 1,056,784
- 1,059,683,225,053,915,111,058,165,141,686,995
- 1,085,764
- 1,098,765,432
- 1,111,111
- 1,111,111,111
- 1,111,111,111,111
- 1,111,111,111,111,111
- 1,111,111,111,111,111,111
- 1,111,111,111,111,111,111,111
- 1,111,111,111,111,111,111/Historical Note
- 1,111,111,111/Mistake
- 1,111,111,111/Mistake/First Edition
- 1,111,111,111/Mistake/Second Edition
- 1,122,659
- 1,175,265
- 1,234,321
- 1,234,567,891
- 1,234,567,891,234,567,891,234,567,891
- 1,238,926,361,552,897
- 1,257,787
- 1,257,787/Historical Note
- 1,269,621
- 1,322,314,049,613,223,140,496
- 1,367,631
- 1,375,298,099
- 1,398,269
- 1,398,269/Historical Note
- 1,425,600
- 1,438,983
- 1,476,304,896
- 1,480,028,171
- 1,533,776,805
- 1,594,323
- 1,679,616
- 1,680,861
- 1,741,725
- 1,747,515
- 1,771,561
- 1,786,772,701,928,802,632,268,715,130,455,793
- 1,787,109,376
- 1,857,437,604
- 1,979,339,333
- 1,979,339,339
- 1-Seminorm on Continuous on Closed Interval Real-Valued Functions is Norm
- 1-Sequence Space is Proper Subset of 2-Sequence Space
- 1-Sequence Space is Separable
- 1/Historical Note
- 1/Linguistic Note
- 10
- 10,000
- 10,000,000
- 10,001
- 10,101
- 10,112,359,550,561,797,752,808,988,764,044,943,820,224,719
- 10,206
- 10,213,223
- 10,585
- 10,662,526,601
- 10,744
- 10,856
- 10,989
- 10/Historical Note
- 10/Linguistic Note
- 100
- 100,000
- 100,001
- 100,895,598,169
- 100/Historical Note
- 100/Linguistic Note
- 1000
- 1000/Historical Note
- 1001
- 1001/Historical Note
- 1002
- 1008
- 1009
- 100 in Golden Mean Number System is Equivalent to 011
- 100 using Digits from 1 to 9
- 100 using Digits from 1 to 9/Historical Note
- 100 using Four 9s
- 100 using Four 9s/Solution 1
- 100 using Four 9s/Solution 2
- 101
- 101/Historical Note
- 1013
- 1015
- 1019
- 101 is Smallest Number whose Period of Reciprocal is 4
- 102
- 1021
- 1024
- 1024/Historical Note
- 1027
- 103
- 103,040
- 1031
- 1031/Historical Note
- 1033
- 1034
- 1035
- 1039
- 103 is Smallest Prime whose Period of Reciprocal is One Third of Maximal
- 104
- 1045
- 1049
- 105
- 1050
- 1051
- 1056
- 106
- 1061
- 1063
- 1069
- 107
- 107,928,278,317
- 1071
- 108
- 1080
- 1081
- 1086
- 1087
- 1089
- 1089 Trick
- 109
- 109,297
- 109,376
- 109,418,989,131,512,359,209
- 1091
- 1093
- 1097
- 10 Consecutive Integers contain Coprime Integer
- 10 Consecutive Integers contain Coprime Integer/Historical Note
- 10 is Only Triangular Number that is Sum of Consecutive Odd Squares
- 11
- 11,000,001,446,613,353
- 11,111
- 11,111,111
- 11,111,111,111
- 11,111,111,111,111
- 11,111,111,111,111,111
- 11,111,111,111,111,111,111
- 11,111,111,111,111,111,111,111
- 11,164
- 11,213
- 11,213/Historical Note
- 11,390,625
- 11,410,337,850,553
- 11,549
- 11,593
- 11,597
- 11,617
- 11,621
- 11,633
- 11,657
- 11,677
- 11,681
- 11,689
- 11,826
- 11,881
- 11/Historical Note
- 110
- 110,059
- 110,503
- 1103
- 1104
- 1105
- 1105 as Sum of Two Squares
- 1107
- 1109
- 111
- 111,111
- 111,111,111
- 111,111,111,111
- 111,111,111,111,111
- 111,111,111,111,111,111
- 111,111,111,111,111,111,111
- 111,777
- 1111
- 1112
- 1113
- 1114
- 1115
- 1116
- 1117
- 1118
- 112
- 112,359,550,561,797,752,809
- 112/Historical Note
- 1123
- 1127
- 1128
- 1129
- 113
- 1131
- 114
- 114,689
- 114, 381,625, 757,888, 867,669, 235,779, 976,146, 612,010, 218,296, 721,242, 362,562, 561,842, 935,706, 935,245, 733,897, 830,597, 123,563, 958,705, 058,989, 075,147, 599,290, 026,879, 543,541
- 1140
- 1141
- 1144
- 1146
- 1148
- 115
- 115,132,219,018,763,992,565,095,597,973,971,522,400
- 115,132,219,018,763,992,565,095,597,973,971,522,401
- 1151
- 1153
- 1156
- 116
- 116,415,321,826,934,814,453,125
- 1160
- 1162
- 1163
- 1165
- 1166
- 1167
- 117
- 117,649
- 1171
- 1176
- 1177
- 118
- 118,132,654,413,675,138,222
- 1181
- 1183
- 1184
- 1187
- 1189
- 119
- 1190
- 1193
- 1197
- 11 is Only Palindromic Prime with Even Number of Digits
- 12
- 12,157,692,622,039,623,539
- 12,285
- 12,321
- 12,345,678,901,234,567,891
- 12,345,679
- 12,367
- 12,496
- 12,758
- 12,890,625
- 12,960,000
- 12,960,000/Historical Note
- 12,988,816
- 12/Historical Note
- 120
- 120/Historical Note
- 1201
- 1209
- 121
- 121,174,811
- 121,174,841
- 121,174,871
- 121,174,901
- 121,174,931
- 121,174,961
- 1210
- 1212
- 121 is Square Number in All Bases greater than 2
- 122
- 122,410
- 1223
- 1224
- 1225
- 1229
- 123
- 123,454,321
- 123,455,554,321
- 123,456,789
- 1231
- 1233
- 123456789 x 8 + 9 = 987654321
- 123456789 x 9 + 10 = 1111111111
- 124
- 1240
- 1247
- 1249
- 125
- 125,000
- 125,000/Historical Note
- 125,411,328,000
- 1255
- 1259
- 126
- 1260
- 1261
- 1264
- 1266
- 1268
- 127
- 1275
- 1276
- 1277
- 1279
- 128
- 1281
- 1283
- 1285
- 1285 9-ominoes
- 1288
- 1289
- 129
- 129,572,008
- 1291
- 1296
- 1297