A140180 A number n is included if the smallest prime that is congruent to 1 (mod n) is <= the smallest prime that is congruent to -1 (mod n).
1, 2, 5, 10, 11, 13, 16, 22, 23, 25, 26, 28, 29, 33, 35, 36, 39, 40, 41, 43, 46, 50, 52, 53, 56, 58, 61, 63, 65, 66, 67, 70, 73, 78, 81, 82, 83, 86, 88, 89, 92, 93, 95, 96, 100, 101, 105, 106, 111, 112, 113, 116, 119, 122, 124, 125, 126, 127, 130, 131, 134, 136, 145
Offset: 1
Keywords
Examples
For n = 1 and 2 the smallest prime that is congruent to 1 (mod n) equals the smallest prime that is congruent to -1 (mod n). For all other n the inequality is strict.
Links
- Diana Mecum, Table of n, a(n) for n = 1..567
Extensions
More terms from Diana L. Mecum, Jul 04 2008