%I #8 Jun 12 2017 19:22:14
%S 2,4,16,38,40,44,70,82,86,88,116,128,130,142,152,158,170,178,194,224,
%T 226,238,262,268,298,304,310,320,346,352,362,364,368,392,406,418,434,
%U 446,452,458,460,472,478,490,494
%N Numbers n such that 23*n^2 - 9 is prime.
%e If n=88 then 23*n^2 - 9 = 178103 (prime).
%t Select[Range[500], PrimeQ[(23#^2 - 9)] &] (* _Stefan Steinerberger_, Feb 28 2006 *)
%o (PARI) is(n)=isprime(23*n^2-9) \\ _Charles R Greathouse IV_, Jun 12 2017
%K nonn,easy
%O 1,1
%A _Parthasarathy Nambi_, Sep 30 2005
%E More terms from _Stefan Steinerberger_, Feb 28 2006