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 A182583 #8 May 07 2012 12:53:11 %S A182583 3,5,7,11,13,23,29,31,43,53,61,71,73,89,109,127,139,149,163,229,257, %T A182583 263,271,277,307,331,337,383,389,419,433,449,457,463,479,523,541,607, %U A182583 631,643,647,653,661,673,691,727,761,769,797,809,821,823,829,859,881 %N A182583 Primes p such that (5p^2-1)/4 is also prime. %H A182583 Zak Seidov, <a href="/A182583/b182583.txt">Table of n, a(n) for n = 1..1000</a> %F A182583 a(n) = 2*A104012(n) + 1. %t A182583 Select[Prime[Range[200]], PrimeQ[(5*#^2 - 1)/4] &] (* _T. D. Noe_, May 07 2012 *) %Y A182583 Cf. A104012. %K A182583 nonn %O A182583 1,1 %A A182583 _Zak Seidov_, May 06 2012