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Primes p such that 43 is not a square mod p.
2

%I #16 Apr 23 2018 08:28:51

%S 2,5,11,23,29,31,37,47,59,61,67,73,79,83,89,103,107,113,127,137,139,

%T 149,157,167,233,239,241,251,257,271,277,283,307,311,313,349,359,367,

%U 373,379,389,409,421,431,433,439

%N Primes p such that 43 is not a square mod p.

%C Also, only entries p = 1 (mod 4) of the sequence are not squares mod 43 (from the quadratic reciprocity law). - _Lekraj Beedassy_, Jul 21 2004

%C Inert primes in Z[sqrt(43)]. - _Alonso del Arte_, Apr 17 2018

%H Vincenzo Librandi, <a href="/A038924/b038924.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Prime@Range[120], JacobiSymbol[43, #] == -1 &] (* _Vincenzo Librandi_, Sep 09 2012 *)

%o (PARI) select(n->!issquare(Mod(43,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