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 A059809 #25 Aug 13 2015 05:41:45 %S A059809 2,3,4,5,6,8,10,12,14,18,20,24,32,48,60,72,168,720 %N A059809 Numbers that do not contain exactly the same digits in two different smaller bases. %C A059809 Also numbers that cannot be expressed as the two-digit numbers a b (base r) and b a (base s) for two different smaller bases r and s (i.e., 2-digit "reversals"), and the numbers that cannot be expressed as "reversals" of any length for two different smaller bases. I can prove this. - _Francis J. McDonnell_, Jul 28 2015 %H A059809 Sascha Kurz, <a href="http://www.mathe2.uni-bayreuth.de/sascha/oeis/paper/digits.ps">A059809 is finite</a> (shows that there are no other terms) [Broken link] %e A059809 8 written in bases 2 through 7 is 1000, 22, 20, 13, 12, 11 and none of these are permutations of another one. %Y A059809 Cf. A059808. %K A059809 base,nonn,fini,full %O A059809 1,1 %A A059809 _Erich Friedman_, Feb 24 2001 %E A059809 More terms from _Naohiro Nomoto_, Oct 04 2001, who remarks that there are no others < 10000. %E A059809 Offset set to 1 by _Michel Marcus_, Aug 03 2015