This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A120460 #4 Apr 25 2017 12:09:26 %S A120460 3,5,7,13,19,23,29,47,61,83,97,127,149,163,173,181,191,211,239,251, %T A120460 257,281,307,313,317,331,359,373,383,419,433,439,449,467,491,503,593, %U A120460 607,617,631,643,701,709,719,751,797,811,839,859,883,887,937,971,1013,1049 %N A120460 Primes p such that (3*p^2+1)/4 is prime. %C A120460 Prime terms in A121259 = numbers n such that (3n^2+1)/4 is prime. %H A120460 Harvey P. Dale, <a href="/A120460/b120460.txt">Table of n, a(n) for n = 1..1000</a> %t A120460 Select[Prime[Range[200]],PrimeQ[(3#^2+1)/4]&] (* _Harvey P. Dale_, Apr 25 2017 *) %Y A120460 Cf. A121259. %K A120460 base,nonn %O A120460 1,1 %A A120460 _Zak Seidov_, Aug 25 2006