%I #7 Sep 07 2012 13:39:56
%S 2,5,11,13,17,19,23,37,59,67,79,83,103,109,113,127,149,163,191,197,
%T 199,227,229,233,257,263,293,307,311,313,317,331,337,349,367,379,397,
%U 421,433,439,461,499,503,509,521
%N 26 is a square mod p.
%H Vincenzo Librandi, <a href="/A038899/b038899.txt">Table of n, a(n) for n = 1..1000</a>
%t Select[Prime[Range[100]], JacobiSymbol[26, #] != -1 &] (* _Vincenzo Librandi_, Sep 07 2012 *)
%K nonn
%O 1,1
%A _N. J. A. Sloane_.