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 A036928 #19 May 18 2022 07:56:36
%S A036928 121,1111,1331,10201,12221,14641,111221,112211,134431,161051,1021211,
%T A036928 1030301,1112221,1223431,1234321,1478741,1771561,10212211,11121011,
%U A036928 11233321,11333311,12101111,12234431,13457741,13577531,16266151
%N A036928 Composite numbers whose prime factors contain no digits other than 0 and 1.
%H A036928 <a href="/index/Pri#prime_factors">Index entries for sequences related to prime factors</a>.
%F A036928 Sum_{n>=1} 1/a(n) = Product_{p in A020449} (p/(p - 1)) - Sum_{p in A020449} 1/p - 1 = 0.0102023428... . - _Amiram Eldar_, May 18 2022
%Y A036928 Cf. A020449, A036302-A036325, A036929.
%K A036928 nonn,base
%O A036928 1,1
%A A036928 _Patrick De Geest_, Jan 04 1999
%E A036928 Description clarified by _Ray Chandler_, Nov 07 2008