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30 is a square mod p.
2

%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_.