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 A261917 #9 Sep 13 2015 17:16:06 %S A261917 5,7,8,9,10,13,14,15,16,19,20,21,22,25,27,28,29,30,32,33,34,35,37,38, %T A261917 39,40,42,43,44,45,47,48,49,50,53,54,55,56,58,59,60,61,63,64,65,66,68, %U A261917 69,70,71,73,74,75,76,77,79,80,81,82,84,85,86,87,89,90,91,92,94,95,96,97,99 %N A261917 Numbers which in base 5 are the sum of two palindromes but are not palindromes themselves. %H A261917 N. J. A. Sloane, <a href="/A261917/b261917.txt">Table of n, a(n) for n = 1..13703</a> %Y A261917 Cf. A029952 (palindromes), A261907 (base 10 analog), A261918. %K A261917 nonn,base %O A261917 1,1 %A A261917 _N. J. A. Sloane_, Sep 13 2015