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 A336827 #11 Sep 26 2020 14:35:22 %S A336827 1,22,22,9831,314767045,1916060910,455075911977 %N A336827 a(n) is the largest integer that can be written in two bases smaller than n as mutually-reversed strings of digit(s), for n>=4. %e A336827 a(5) is 22 because 22 = 211 (base 3) = 112 (base 4) is the largest such integer with both bases < 5 (here 3 and 4). %e A336827 a(6) is also 22 because there are no larger such integers with both bases < 6. %e A336827 a(7) is 9831 because 9831 = 303311 (base 5) and 113303 (base 6) is the largest such integer with both bases < 7 (here 5 and 6). %Y A336827 Cf. A336733, A336768. %K A336827 nonn,base,more %O A336827 4,2 %A A336827 _Michel Marcus_, Aug 05 2020 %E A336827 a(9)-a(10) from _Bert Dobbelaere_, Sep 20 2020