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Primes p such that 53 is not a square mod p.
1

%I #7 Aug 24 2012 08:50:06

%S 2,3,5,19,23,31,41,61,67,71,73,79,83,101,103,109,127,137,139,151,157,

%T 167,173,179,181,191,193,233,239,251,257,263,277,283,313,337,349,353,

%U 359,373,379,383,389,397,401,419

%N Primes p such that 53 is not a square mod p.

%H Vincenzo Librandi, <a href="/A038932/b038932.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Prime[Range[500]],!JacobiSymbol[53,#]!=-1&] (* _Vincenzo Librandi_, Aug 24 2012 *)

%K nonn

%O 1,1

%A _N. J. A. Sloane_.