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 A131929 #11 Jan 10 2023 01:20:45
%S A131929 0,1,1,0,1,0,1,0,0,0,1,1,1,0,1,0,1,0,1,1,0,1,1,1,1,1,0,1,1,1,1,1,1,0,
%T A131929 1,1,1,0,1,0,1,1,1,0,1,0,1,0,0,1,0,1,1,0,1,0,0,0,1,0,1,1,1,0,1,0,1,0,
%U A131929 0,1,1,1,1,0,1,0,1,0,1,0,0,1,1,0,1,0,0,0,1,0,0,1,1,0,1,0,1,0,0,0,1,1,1,0,1
%N A131929 Number of prime factors of n that are contained in decimal representation of n.
%C A131929 a(A050695(n)) = 0; a(A131930(n)) > 0;
%C A131929 a(A131931(n)) = n and a(m) <> n for m < A131931(n).
%H A131929 Reinhard Zumkeller, <a href="/A131929/b131929.txt">Table of n, a(n) for n = 1..10000</a>
%e A131929 a(230) = a(23*5*2) = #{2,23} = 2.
%Y A131929 Cf. A131930, A131931.
%K A131929 nonn,base
%O A131929 1,132
%A A131929 _Reinhard Zumkeller_, Jul 30 2007