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 A106571 #13 Mar 14 2018 06:54:43 %S A106571 5,7,11,13,17,19,23,25,27,29,31,35,37,41,43,47,49,51,53,55,59,61,63, %T A106571 65,67,69,71,73,75,77,79,83,85,87,89,91,93,95,97,101,103,107,109,113, %U A106571 115,119,121,125,127,129,131,133,135,137,139,141,143,145,149,151,153,155 %N A106571 Indices n of perfect squares n^2 which are not the difference of two primes. %C A106571 Also, n such that 1+n^2 is a nontotient (A005277). - _T. D. Noe_, Sep 13 2007 %H A106571 T. D. Noe, <a href="/A106571/b106571.txt">Table of n, a(n) for n=1..1000</a> %F A106571 a(n) = sqrt(A106564(n)). %e A106571 a(3)=11 because the third square which is not the difference of two primes (121=11^2) is the 11th one in the succession of the perfect squares (thus index 11). %Y A106571 Cf. A106544-A106548, A106562-A106564, A106573-A106575, A106577. %Y A106571 Cf. A067201 (n such that n^2 + 2 is prime). %K A106571 easy,nonn %O A106571 1,1 %A A106571 _Alexandre Wajnberg_, May 09 2005 %E A106571 Extended by _Ray Chandler_, May 12 2005