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%I #4 Apr 25 2017 12:09:26
%S 3,5,7,13,19,23,29,47,61,83,97,127,149,163,173,181,191,211,239,251,
%T 257,281,307,313,317,331,359,373,383,419,433,439,449,467,491,503,593,
%U 607,617,631,643,701,709,719,751,797,811,839,859,883,887,937,971,1013,1049
%N Primes p such that (3*p^2+1)/4 is prime.
%C Prime terms in A121259 = numbers n such that (3n^2+1)/4 is prime.
%H Harvey P. Dale, <a href="/A120460/b120460.txt">Table of n, a(n) for n = 1..1000</a>
%t Select[Prime[Range[200]],PrimeQ[(3#^2+1)/4]&] (* _Harvey P. Dale_, Apr 25 2017 *)
%Y Cf. A121259.
%K base,nonn
%O 1,1
%A _Zak Seidov_, Aug 25 2006
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