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 A226858 #18 Sep 07 2013 09:46:32 %S A226858 258594336000,1034377344000,2327349024000,4137509376000,6464858400000, %T A226858 9309396096000,12671122464000,16550037504000,20946141216000, %U A226858 25859433600000 %N A226858 Numbers n such that there are six distinct triples (k, k+n, k+2n) of squares. %C A226858 For the first 10 terms we have a(n) = n^2 * a(1). Are there any other primitive terms other than a(1)? %e A226858 These 6 triples have a common difference of 9309396096000: (579774^2, 3105726^2, 4353726^2), (781560^2, 3149640^2, 4385160^2), (2241720^2, 3786120^2, 4862520^2), (4187880^2, 5181480^2, 6013080^2), (9320040^2, 9806760^2, 10270440^2), and (10273140^2, 10716660^2, 11142540^2). %Y A226858 Cf. A198387, A222154, A222155, A214155, A226954. %K A226858 nonn,more %O A226858 1,1 %A A226858 _Zdenek Cervenka_, Jun 20 2013