A140181 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, 3, 4, 6, 7, 8, 9, 12, 14, 15, 17, 18, 19, 20, 21, 24, 27, 30, 31, 32, 34, 37, 38, 42, 44, 45, 47, 48, 49, 51, 54, 55, 57, 59, 60, 62, 64, 68, 69, 71, 72, 74, 75, 76, 77, 79, 80, 84, 85, 87, 90, 91, 94, 97, 98, 99, 102, 103, 104, 107, 108, 109, 110, 114, 115, 117

Offset: 1

Author

Leroy Quet, May 11 2008

Keywords

• nonn

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..725

Crossrefs

Cf. A093868, A140180.

Extensions

More terms from Diana L. Mecum, Jul 04 2008