Friday, February 4, 2011

Interesting prime numbers

11 (prime number)

but
111 = 3 * 37
1111 = 11 * 101
11111 = 41 * 271

13 (prime number)
113 (prime number)
1113 = 3 * 7 * 53

17 (prime number)
117 = 3^2 * 13

19 (prime number)
119 = 7 * 17

23 (prime number)
223 (prime number)
2223 = 3^2 * 13 * 19

29 (prime number)
229 (prime number)
2229 = 3 * 743



31
331
3331
33331
333331
3333331
33333331


but 333333331 = 17 * 19607843





37
337
3337 = 47 * 71

41
441 = 3^2 * 7^2

43
443
4443 = 3 * 1481

47
447 = 3 * 149

53
553 = 7 * 79

59
559 = 13 * 43

61
661
6661
66661 = 7 * 89 * 107

67
667 = 23 * 29

71
771 = 3 * 257

73
773
7773 = 3 * 2591

79
779 = 19 * 41

83
883
8883 = 3^3 * 7 * 47

89
889 = 7 * 127

97
997
9997 = 13 * 769

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