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%I #4 Feb 20 2017 14:52:50
%S 1,2,3,4,6,7,9,11,13,14,15,17,20,22,24,25,26,27,29,30,35,36,37,38,39,
%T 46,48,55,59,61,68,69,72,75,77,79,82,88,91,93,94,102,105,107,108,115,
%U 116,117,118,121,124,130,134,136,137,140,149,152,154,157,158,159,162,167
%N Numbers n such that 12n^2 - 1 is prime.
%t p = 12; a = {}; Do[k = p x^2 - 1; If[PrimeQ[k], AppendTo[a, x]], {x, 1, 1000}]; a
%o (PARI) is(n)=isprime(12*n^2-1) \\ _Charles R Greathouse IV_, Feb 20 2017
%Y Cf. A066436, A066049, A090686, A090684, A143826, A143827, A143828, A143829, A143830.
%K nonn
%O 1,2
%A _Artur Jasinski_, Sep 02 2008