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 A216843 #21 Aug 19 2015 23:30:16 %S A216843 624,910,19040,17520,7056,16842,13320,42876,30480,27650,14376,18226, %T A216843 22708,27870,33760,50524,71856,70338,55981,113694,107888,75810,139920, %U A216843 223000,140608,157464,175616,195112,125000,238328,262144,287496,314432,343000,238329 %N A216843 Smallest palindromic numbers of length 4 in two bases differing by n. %C A216843 See A216841 and A216840 for their comment sections. The A171*** c-refs are to various record small multi-base palindromes. The others are the remainder of this collection. %H A216843 Chai Wah Wu, <a href="/A216843/b216843.txt">Table of n, a(n) for n = 2..1000</a> %e A216843 624 (in decimal), the 1st term here, is 4444 in base 5 and 1551 in base 7. %Y A216843 Cf. A171701, A171702, A171703, A171704, A171705, A171706, A171740, A171741, A171742, A171775, A216840, A216841, A216899, A216900, A216901, A216902, A216903, A216904, A216905, A216906, A216907, A216908, A216909, A216910. %K A216843 nonn,base %O A216843 2,1 %A A216843 _James G. Merickel_, Sep 19 2012 %E A216843 More terms from _Chai Wah Wu_, Aug 16 2015