A267481 Primes which are squares (mod 31).

2, 5, 7, 19, 31, 41, 47, 59, 67, 71, 97, 101, 103, 107, 109, 113, 131, 149, 157, 163, 173, 191, 193, 211, 227, 233, 257, 281, 283, 293, 307, 311, 317, 349, 359, 373, 379, 397, 419, 421, 431, 439, 443, 467, 479, 503, 521, 541, 547, 563, 577, 593, 599, 607, 617, 653, 659, 661, 683

Offset: 1

Author

M. F. Hasler, Jan 15 2016

Keywords

• nonn

Crossrefs

Cf. A191040.

Programs

PARI

select(p->issquare(Mod(p,31))&&isprime(p),[1..1000]) \\ This is to provide a generic characteristic function as 1st arg of select(), there are other ways to produce the sequence more efficiently. - M. F. Hasler, Jan 15 2016