%I #10 Sep 08 2022 08:44:53
%S 3,13,19,23,31,47,53,73,79,89,101,103,109,113,127,131,137,163,167,173,
%T 179,181,197,211,227,229,233,239,241,257,269,271,293,311,313,317,331,
%U 347,359,367,397,409,419,431,433
%N Primes p such that 86 is not a square mod p.
%H Vincenzo Librandi, <a href="/A038974/b038974.txt">Table of n, a(n) for n = 1..1000</a>
%t Select[Prime[Range[100]],JacobiSymbol[86,#]==-1&] (* _Harvey P. Dale_, Feb 02 2012 *)
%o (Magma) [ p: p in PrimesUpTo(433) | not IsSquare(R! 86) where R:= ResidueClassRing(p) ]; // _Vincenzo Librandi_, Sep 10 2012
%K nonn,easy
%O 1,1
%A _N. J. A. Sloane_.
%E Offset changed from 0 to 1 by _Vincenzo Librandi_, Sep 10 2012