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 A043349 #17 Apr 24 2021 01:59:38
%S A043349 5,10,15,20,26,27,28,29,30,35,40,45,51,52,53,54,55,60,65,70,76,77,78,
%T A043349 79,80,85,90,95,101,102,103,104,105,110,115,120,131,132,133,134,136,
%U A043349 137,138,139,141,142,143,144,146,147,148,149,151
%N A043349 Numbers having one 0 in base 5.
%F A043349 A023722 \ {0}. - _R. J. Mathar_, Oct 20 2008
%Y A043349 Cf. A007091, A023722.
%K A043349 nonn,base
%O A043349 1,1
%A A043349 _Clark Kimberling_