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 A026470 #8 Apr 22 2016 23:17:34 %S A026470 2,3,4,5,6,7,9,10,11,12,14,15,16,17,19,21,22,23,24,26,27,28,30,31,33, %T A026470 35,36,37,38,39,42,43,44,46,47,48,49,51,54,55,56,57,59,60,62,63,64,66, %U A026470 67,68,69,70,71,73,75,76,77,78,79,80 %N A026470 a(n) = least positive integer > a(n-1) and not a(i)^2 + a(j)^2 for 1<=i<=j<=n. %K A026470 nonn %O A026470 1,1 %A A026470 _Clark Kimberling_ %E A026470 Corrected by _Franklin T. Adams-Watters_, Oct 25 2006