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 A086067 #10 Sep 03 2021 05:56:02 %S A086067 1,10,100,1000,10000,100000,1000000,10000000,100000000,1000000000,11, %T A086067 10,110,1010,10010,100010,1000010,10000010,100000010,1000000010,101, %U A086067 110,100,1100,10100,100100,1000100,10000100,100000100,1000000100 %N A086067 Bit string encoding occurrence of digits of n in decimal representation: d-th bit is set iff d occurs in (n)10, 0 <= d < 10. %F A086067 a(n) = A007088(A086066(n)). %Y A086067 Cf. A007088, A086066. %K A086067 nonn,base %O A086067 0,2 %A A086067 _Reinhard Zumkeller_, Jul 08 2003