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 A216906 #14 Aug 22 2015 00:49:44 %S A216906 248876637484140,1013960892216384,1093158208940760,101975569769446364, %T A216906 16699985993414520,1310809863419914830,331113952227684640 %N A216906 Smallest palindromic number of length 12 in two bases differing by n. %C A216906 See comments in A216840, A216841. Smaller of pair of bases are 17, 20, 19, 28, 23. A216*** cross-references are other sequences in a collection that includes this one, while A171*** sequences are various record multi-base palindromes. %e A216906 The first term is 747B6336B747 in base 17 and 22B4I88I4B22 in base 19. %Y A216906 Cf. A171701, A171702, A171703, A171704, A171705, A171706, A171740, A171741, A171742, A171775, A216840, A216841, A216843, A216899, A216900, A216901, A216902, A216903, A216904, A216905, A216907, A216908, A216909, A216910. %K A216906 nonn,base %O A216906 2,1 %A A216906 _James G. Merickel_, Sep 19 2012 %E A216906 a(7)-a(8) from _Chai Wah Wu_, Aug 19 2015