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 A106577 #4 Mar 31 2012 14:11:37 %S A106577 2,3,4,6,8,9,10,12,14,15,16,18,20,21,22,24,26,28,30,32,33,34,36,38,40, %T A106577 42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80,82,84,86, %U A106577 88,90,92,94,96,98,100,102,104,106,108,110,112,114,116,117,118,120,122 %N A106577 Indices n of perfect squares n^2 which are both the sum and the difference of two primes. %F A106577 a(n) = SQRT(A106575(n)). %e A106577 a(3)=4 because the third square which is the sum and the difference of two primes (16=4^2) is the 4th one in %e A106577 the succession of the perfect squares (thus: index 4). %Y A106577 Cf. A106544-A106548, A106562-A106564, A106571, A106573-A106575. %K A106577 easy,nonn %O A106577 1,1 %A A106577 _Alexandre Wajnberg_, May 09 2005 %E A106577 Extended by _Ray Chandler_, May 12 2005