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 A336069 #6 Jul 08 2020 05:09:11
%S A336069 2,8,7,1,0,6,1,3,1,8,6,6,3,4,7,1,7,3,2,2,2,8,6,1,0,3,8,3,0,0,4,9,5,5,
%T A336069 1,0,5,9,1,4,4,3,8,1,2,3,0,9,3,8,8,9,0,6,1,0,5,5,9,2,6,9,5,7,1,0,3,8,
%U A336069 1,4,2,1,3,2,1,0,9,1,2,0,9,0,1,9,0,3,4
%N A336069 Decimal expansion of the asymptotic density of numbers k divisible by A007949(k) (A336068).
%H A336069 Tibor Šalát, <a href="https://dml.cz/handle/10338.dmlcz/129777">On the function a_p, p^a_p(n) || n (n > 1)</a>, Mathematica Slovaca, Vol. 44, No. 2 (1994), pp. 143-151.
%F A336069 Equals 2 * Sum_{k>=1} 1/(k * 3^(k - A007949(k) + 1)).
%e A336069 0.287106131866347173222861038300495510591443812309388...
%t A336069 RealDigits[2 * Sum[1/k/3^(k + 1 - IntegerExponent[k, 3]), {k, 1, 1000}], 10, 100][[1]]
%Y A336069 Cf. A007949, A336067, A336068.
%K A336069 nonn,cons
%O A336069 0,1
%A A336069 _Amiram Eldar_, Jul 07 2020