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 A097880 #21 Oct 30 2022 15:06:37
%S A097880 1,0,6,8,3,2,7,9,0,3,3,4,6,4,0
%N A097880 Decimal expansion of the sum for 1 to infinity of fraction sequence with numerator triangular numbers and denominator sum of 4th power of primes.
%C A097880 The partial sum over the first 1 million primes is 0.106832790334640030...
%C A097880 The partial sum over the first 3 million primes is 0.1068327903346400495...
%F A097880 Equals Sum_{n >=1} A000217(n)/A122102(n). - _R. J. Mathar_, Dec 07 2014
%e A097880 T4 = 0.1068327...
%K A097880 more,nonn,cons
%O A097880 1,3
%A A097880 _Pierre CAMI_, Sep 02 2004