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Primes p such that 78 is a square mod p.
1

%I #7 Sep 08 2012 05:16:20

%S 2,3,7,11,13,23,29,31,37,41,43,53,59,83,89,101,109,137,139,151,173,

%T 191,211,223,227,229,263,269,271,281,283,311,313,337,349,353,389,397,

%U 401,421,433,449,463,487,503,523

%N Primes p such that 78 is a square mod p.

%H Vincenzo Librandi, <a href="/A038963/b038963.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Prime[Range[110]], ! JacobiSymbol[78, #] == -1 &] (* _Vincenzo Librandi_, Sep 08 2012 *)

%K nonn

%O 1,1

%A _N. J. A. Sloane_.