A038948 - OEIS

%I #7 Sep 09 2012 14:53:37

%S 7,23,29,37,47,67,71,73,79,83,89,101,107,113,127,131,137,149,151,157,

%T 163,173,181,191,193,197,227,229,241,257,271,293,311,331,337,347,353,

%U 379,383,397,401,409,421,439,449

%N Primes p such that 66 is not a square mod p.

%H Vincenzo Librandi, <a href="/A038948/b038948.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Prime@Range[120], JacobiSymbol[66, #] == - 1 &] (* _Vincenzo Librandi_, Sep 09 2012 *)

%o (PARI) select(n->!issquare(Mod(66,n)),primes(100)) \\ _Charles R Greathouse IV_, Sep 09 2012

%K nonn

%O 1,1

%A _N. J. A. Sloane_.

%E Offset changed from 0 to 1 by _Vincenzo Librandi_, Sep 09 2012