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 A273056 #6 May 14 2016 15:35:28 %S A273056 1,2,3,7,13,13,17,29,31,61,61,61,61,61,61,61,61,109,109,109,109,109, %T A273056 109,109,109,128,128,128,128,128,128,128,128,256,256,256,256,256,256, %U A273056 256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,256,512,512,512,512,512 %N A273056 Discriminator of Sylvester's sequence A000058. %C A273056 The discriminator of a sequence is the least positive integer k such that the first n terms of the sequence are pairwise incongruent, modulo k. %Y A273056 Cf. A000058. %K A273056 nonn %O A273056 1,2 %A A273056 _Jeffrey Shallit_, May 14 2016