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 A100128 #9 Feb 01 2025 15:00:05
%S A100128 5,5,8,3,2,7,6,2,2,2,3,1,7,6,9,1,5,8,6,1,4,2,7,9,1,9,6,8,0,3,6,0,4,6,
%T A100128 9,5,1,7,5,2,5,2,1,2,8,2,0,8,7,4,2,0,1,7,3,9,0,2,2,2,9,1,7,4,2,3,5,8,
%U A100128 5,4,7,6,3,3,1,6,3,7,6,1,7,6,5,2,0,0,9,3,6,9,6,7,2,6,5,2,1,0,4,0
%N A100128 Decimal expansion of Sum_{n>0} 1/(n*prime(n)^n).
%e A100128 0.5583276222317691586142791968036046951752521282087420173902229174235854763316376176520093696726521040...
%o A100128 (PARI) suminf(k=1, 1/(k*prime(k)^k))
%Y A100128 Cf. A094289, A100124, A100126, A100127.
%K A100128 cons,nonn
%O A100128 0,1
%A A100128 Mark Hudson (mrmarkhudson(AT)hotmail.com), Nov 11 2004