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 A249717 #6 Nov 05 2014 11:22:12 %S A249717 1,1,1,1,2,1,2,1,2,3,3,1,2,3,2,3,2,2,3,3,2,3,2,1,2,5,5,3,2,3,2,3,2,2, %T A249717 2,2,2,3,2,3,2,2,2,3,2,3,3,3,2,7,5,5,2,5,3,3,2,2,2,3,2,2,2,3,2,2,2,2, %U A249717 2,2,2,2,2,2,2,5,2,5,2,3,2,3,3,3,2,3,2,3,2,2,3,3,2,3,2,3,2,2,7,3,2,5,2,5,2,2,2,5,2,3,2,3,2,2,2,2,2,3,3,3,2 %N A249717 The smallest prime whose square divides the first nonsquarefree number on row n of Pascal's triangle, 1 if all terms on that row are squarefree. %C A249717 All such n, for which a(n) < 3, form a subsequence of A249724. %F A249717 a(n) = A249739(A249716(n)). %o A249717 (Scheme) (define (A249717 n) (A249739 (A249716 n))) %Y A249717 Cf. A249716, A249739, A249724. %Y A249717 Differs from A249718 for the first time at n=36, where a(36) = 2, while A249718(36) = 3. %K A249717 nonn %O A249717 0,5 %A A249717 _Antti Karttunen_, Nov 04 2014