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 A217146 #25 Aug 22 2015 06:34:32
%S A217146 4838419019,6675709063,13663698049,41876599051,45040065175,
%T A217146 97958718154,152621159077,159012936244,269879465085,524268472566,
%U A217146 586808622629,631698774527,866429089209,914610285001,938951012161,1033860873698,1327428637553,1372403843311,1683900384894
%N A217146 Numbers palindromic in 5 digits in at least 4 different (large) bases.
%C A217146 This sequence is generated in pursuit of the 5th term for the cross-referenced sequence. The bases that create 5-digit palindromes for each of the terms shown are:
%C A217146 {91, 125, 144, 161},
%C A217146 {113, 130, 131, 150},
%C A217146 {139, 149, 174, 349},
%C A217146 {148, 193, 390, 450},
%C A217146 {162, 289, 306, 336},
%C A217146 {194, 351, 534, 558}, and
%C A217146 {208, 284, 424, 443}.
%H A217146 Hiroaki Yamanouchi, <a href="/A217146/b217146.txt">Table of n, a(n) for n = 1..52</a>
%e A217146 The number 4383419019 (in base 10) becomes
%e A217146 a) (50)(70)(59)(70)(50) when put in base 91,
%e A217146 b) (19)(102)(33)(102)(19) in base 125,
%e A217146 c) (11)(36)(54)(36)(11) in base 144, and
%e A217146 d) 7(32)(61)(32)7 in base 161.
%Y A217146 Cf. A171704.
%K A217146 nonn,base
%O A217146 1,1
%A A217146 _James G. Merickel_, Sep 27 2012
%E A217146 a(8) added by _James G. Merickel_, Dec 09 2012
%E A217146 Terms sorted and added missing a(6) and a(9)-a(19) by _Hiroaki Yamanouchi_, Aug 22 2015