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 A216905 #13 Aug 22 2015 00:49:34 %S A216905 1556085529,28455496928,671667243106,6286726505905,17441819065567, %T A216905 96396891300626,470389217692631,899379244450606,2169311631182347, %U A216905 6355119734595765,11642138005593761,28921424479420089,55584853414001304,183094184161456101 %N A216905 Smallest palindromic number of 11 digits in two bases differing by n. %C A216905 See comments in A216840 and A216841. Smaller of pair of bases are 7, 9, 12, 15, 16, 19, 22, 23, 25, 28. The A216*** sequences in cross-reference are others in the collection including this one, while A171*** sequences are various record multi-base palindromes. %e A216905 The first term is 53363336335 in base 7 and is 13457775431 in base 8. %Y A216905 Cf. A171701, A171702, A171703, A171704, A171705, A171706, A171740, A171741, A171742, A171775, A216840, A216841, A216843, A216899, A216900, A216901, A216902, A216903, A216904, A216906, A216907, A216908, A216909, A216910. %K A216905 nonn,base %O A216905 1,1 %A A216905 _James G. Merickel_, Sep 19 2012 %E A216905 a(11)-a(14) from _Chai Wah Wu_, Aug 19 2015