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 A347214 #14 Aug 05 2024 13:43:05
%S A347214 3,9,2,9,3,1,4,2,0,3,7,1,8,9,5,8,9,1,3,3,8,8,1,5,7,0,2,4,6,9,8,6,4,3,
%T A347214 0,8,2,7,5,8,6,8,7,1,4,5,4,6,6,0,2,4,2,2,7,2,1,0,8,0,6,0,0,0,1,5,5,9,
%U A347214 6,6,2,9,2,3,7,6,4,8,2,8,1,0,5,7,6,9,9
%N A347214 Decimal expansion of Sum_{k=2..4} zeta(k).
%H A347214 Michael I. Shamos, <a href="https://citeseerx.ist.psu.edu/pdf/ae33a269baba5e8b1038e719fb3209e8a00abec5">Shamos's catalog of the real numbers</a> (2011).
%e A347214 3.9293142037189589133881570246986430827586871454660...
%t A347214 RealDigits[Total[Zeta[{2, 3, 4}]], 10, 120][[1]] (* _Amiram Eldar_, Jun 07 2023 *)
%o A347214 (PARI) zeta(2)+zeta(3)+zeta(4) \\ _Michel Marcus_, Aug 24 2021
%Y A347214 Cf. A002117, A013661, A013662.
%Y A347214 Cf. A347213, A347215, A347216, A347217, A347218, A347219, A347220.
%K A347214 nonn,cons
%O A347214 1,1
%A A347214 _Sean A. Irvine_, Aug 24 2021