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Primes p such that 39 is not a square mod p.
2

%I #6 Sep 09 2012 03:26:53

%S 11,17,29,37,43,47,53,59,71,73,79,83,97,101,103,109,113,127,139,167,

%T 173,193,199,211,227,229,233,239,241,257,269,283,349,359,367,383,389,

%U 397,409,421,431,439,457,479,521

%N Primes p such that 39 is not a square mod p.

%H Vincenzo Librandi, <a href="/A038918/b038918.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Prime@Range[120], JacobiSymbol[39, #] == -1 &] (* _Vincenzo Librandi_, Sep 09 2012 *)

%K nonn

%O 1,1

%A _N. J. A. Sloane_.