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 A015993 #9 Mar 30 2012 17:30:17 %S A015993 2069,2159,2249,2339,2429,2519,2609,2699,2789,2879,2969,3068,3158, %T A015993 3248,3338,3428,3518,3608,3698,3788,3878,3968,4067,4157,4247,4337, %U A015993 4427,4517,4607,4697,4787,4877,4967,5066,5156,5246,5336,5426,5516 %N A015993 Twelve iterations of Reverse and Add are needed to reach a palindrome. %C A015993 The number of iterations starts at 1, so palindromes (cf. A002113) are not excluded. This sequence coincides with the corresponding sequence excluding palindromes (A065217) for the entries shown in the database. The first divergence occurs at 10901. %H A015993 <a href="/index/Res#RAA">Index entries for sequences related to Reverse and Add!</a> %Y A015993 A002113, A065217. %K A015993 nonn,base %O A015993 1,1 %A A015993 _Robert G. Wilson v_