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 A305395 #7 Jun 25 2018 14:02:10 %S A305395 11,101,112,202,213,303,314,404,415,505 %N A305395 Records in A073053. %C A305395 The record-holders are the powers of 2 written in base 4, A004643. %D A305395 M. E. Coppenbarger, Iterations of a modified Sisyphus function, Fib. Q., 56 (No. 2, 2018), 130-141. %Y A305395 Cf. A073053, A004643. %K A305395 nonn,base,more %O A305395 1,1 %A A305395 _N. J. A. Sloane_, Jun 25 2018