%I #7 Sep 07 2012 13:40:01
%S 2,3,5,7,13,17,19,29,37,71,83,101,103,107,113,127,137,139,149,157,191,
%T 211,223,227,233,239,241,257,269,277,311,331,347,353,359,367,373,379,
%U 389,397,409,431,443,461,463,467
%N 30 is a square mod p.
%H Vincenzo Librandi, <a href="/A038903/b038903.txt">Table of n, a(n) for n = 1..1000</a>
%t Select[Prime[Range[100]], JacobiSymbol[30, #] != -1 &] (* _Vincenzo Librandi_, Sep 07 2012 *)
%K nonn
%O 1,1
%A _N. J. A. Sloane_.