A038952 Primes p such that 69 is not a square mod p.

2, 7, 19, 29, 37, 41, 43, 47, 59, 61, 67, 71, 79, 97, 101, 103, 109, 131, 157, 167, 173, 179, 181, 197, 199, 229, 233, 239, 241, 257, 269, 283, 311, 313, 317, 337, 347, 353, 367, 373, 379, 421, 433, 443, 449, 457

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[69, #] == - 1 &] (* Vincenzo Librandi, Sep 09 2012 *)

PARI

select(n->!issquare(Mod(69,n)),primes(100)) \\ Charles R Greathouse IV, Sep 09 2012

Extensions

Offset changed from 0 to 1 by Vincenzo Librandi, Sep 09 2012