A038936 Primes p such that 57 is not a square mod p.

5, 11, 13, 17, 23, 31, 37, 47, 67, 79, 83, 97, 101, 103, 109, 127, 131, 137, 149, 151, 181, 191, 193, 197, 211, 223, 233, 239, 241, 251, 263, 307, 311, 331, 337, 347, 353, 359, 373, 379, 389, 409, 419, 421, 433

Offset: 1

Author

N. J. A. Sloane

Keywords

• nonn

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000

Programs

Mathematica

Select[Prime@Range[120], JacobiSymbol[57, #] == -1 &] (* Vincenzo Librandi, Sep 09 2012 *)

PARI

select(n->!issquare(Mod(57,n)),primes(100)) \\ Charles R Greathouse IV, Sep 09 2012