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

1,2

Links

Diana Mecum, Table of n, a(n) for n = 1..725

Example

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.

Crossrefs

Cf. A093868, A140180.

Sequence in context: A336231 A100290 A344341 * A038032 A010408 A010455

Adjacent sequences: A140178 A140179 A140180 * A140182 A140183 A140184

Keyword

nonn

Author

Leroy Quet, May 11 2008

Extensions

More terms from Diana L. Mecum, Jul 04 2008

Status

approved