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 A216909 #8 Sep 28 2012 13:28:20 %S A216909 4712469842177,14192598568359611,389035682624908873, %T A216909 11713091929744317938,110566060844648951845 %N A216909 Smallest palindromic number of length 15 in two bases differing by n. %C A216909 See comments to A216840 and A216841. Smaller of pair of bases are 7, 12, 15, 19, 22. A216*** sequences in cross-reference are others in a collection including this one, while A171*** ones are various multi-base palindrome records. %e A216909 The first term is 664315252513466 in base 7 and 104446505644401 in base 8. %Y A216909 Cf. A171701, A171702, A171703, A171704, A171705, A171706, A171740, A171741, A171742, A171775, A216840, A216841, A216843, A216899, A216900, A216901, A216902, A216903, A216904, A216905, A216906, A216907, A216908, A216910. %K A216909 nonn,base %O A216909 1,1 %A A216909 _James G. Merickel_, Sep 19 2012