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26 is a square mod p.
2

%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_.