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 A216900 #14 Aug 22 2015 00:49:21 %S A216900 207702,1102816,546645,34028500,1487484,10652864,17438409,55257336, %T A216900 12338379,39957792,81828216,235790724,120261375,75954970,166571505, %U A216900 733418352,276835725,784438752,169796925,433366956,1390393356,2502432704,984536776,5008282776,2289422850 %N A216900 Smallest palindromic number of length 6 in two bases differing by n. %C A216900 Part of a collection. See comments in A216840 and A216841. Smaller bases begin with 8, 11, 10, 19, 13. The A171*** c-refs are to various record multi-base palindromes. The A216*** ones are the others in this collection. %H A216900 Chai Wah Wu, <a href="/A216900/b216900.txt">Table of n, a(n) for n = 2..200</a> %e A216900 207702 is also a palindrome of 6 digits in base 8, and no smaller number is a palindrome of 6 digits in both of two bases. %e A216900 1102816 in base 12 and 15 are 452254 and 16bb61 respectively. - _Chai Wah Wu_, Aug 19 2015 %Y A216900 Cf. A171701, A171702, A171703, A171704, A171705, A171706, A171740, A171741, A171742, A171775, A216840, A216841, A216843, A216899, A216901, A216902, A216903, A216904, A216905, A216906, A216907, A216908, A216909, A216910. %K A216900 nonn,base %O A216900 2,1 %A A216900 _James G. Merickel_, Sep 19 2012 %E A216900 More terms and corrected a(3) from _Chai Wah Wu_, Aug 19 2015