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 A260257 #8 Aug 13 2015 04:09:59 %S A260257 4,12,14,23,29,30,35,37,45,54,58,59,60,61,62,75,77,78,79,80,87,88,92, %T A260257 98,115,116,117,118,119,122,123,125,127,144,147,154,155,158,159,160, %U A260257 163,171,175,179,183,184,190,192,206,207,217,221,222,225,228,232,234,236,238,242,249,255,256,257,258,260,268,269,270,271,272,278,281,284,288,294,301 %N A260257 Numbers n such that A259935(n) = A259935(n-1). %C A260257 For every n, A259934(a(n)-2), A259934(a(n)-1), A259934(a(n)) is arithmetic progression, such that A259934(a(n)-1) is in A175304 (see comment in A259934). %Y A260257 Cf. A175304, A259934, A259935. %K A260257 nonn %O A260257 1,1 %A A260257 _Vladimir Shevelev_, Jul 21 2015