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 A216904 #15 Aug 22 2015 00:49:28 %S A216904 260311602096,1161970522902,3240922809120,16446205929150, %T A216904 5681121663231,86430674537922,36434748011040,2119208930874272, %U A216904 1198501397192925,850466252340408,567228097076960,80847888446187460,5733768413240616,12410554422030840,3028257303808673,32977836735154716,27000016202473335,239720296892530428,57796746638482600 %N A216904 Smallest palindromic number of length 10 in two bases differing by n. %C A216904 See comments in A216840 and A216841. Smaller of pair of bases are 15, 17, 19, 24, 20, 25, 23, 36, 34. The A216*** cross-references are other sequences in the collection that includes this one, while A171*** sequences are various record multi-base palindromes. %e A216904 The first term is 6B882288B6 when written in base 15 and is 2356886532 when written in base 17. %Y A216904 Cf. A171701, A171702, A171703, A171704, A171705, A171706, A171740, A171741, A171742, A171775, A216840, A216841, A216843, A216899, A216900, A216901, A216902, A216903, A216905, A216906, A216907, A216908, A216909, A216910. %K A216904 nonn,base %O A216904 2,1 %A A216904 _James G. Merickel_, Sep 19 2012 %E A216904 a(11)-a(20) from _Chai Wah Wu_, Aug 19 2015