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 A347151 #10 Aug 06 2024 05:58:25
%S A347151 9,9,5,3,2,2,2,6,5,0,1,8,9,5,2,7,3,4,1,6,2,0,6,9,2,5,6,3,6,7,2,5,2,9,
%T A347151 2,8,6,1,0,8,9,1,7,9,7,0,4,0,0,6,0,0,7,6,7,3,8,3,5,2,3,2,6,2,0,0,4,3,
%U A347151 7,2,8,0,7,1,9,9,9,5,1,7,7,3,6,7,6,2,9
%N A347151 Decimal expansion of erf(2).
%H A347151 Michael I. Shamos, <a href="https://citeseerx.ist.psu.edu/pdf/ae33a269baba5e8b1038e719fb3209e8a00abec5">Shamos's catalog of the real numbers</a> (2011).
%F A347151 Equals (2/sqrt(Pi)) * Integral_{x=0..2} exp(-x^2) dx.
%F A347151 Equals (2/sqrt(Pi)) * Sum_{k>=0} (-1)^k * 2^(2*k+1) / (k! * (2*k+1)).
%e A347151 0.995322265018952734162069256367252928610...
%t A347151 First[RealDigits[N[Erf[2],87]]] (* _Stefano Spezia_, Aug 20 2021 *)
%o A347151 (PARI) 1 - erfc(2) \\ _Michel Marcus_, Aug 20 2021
%Y A347151 Cf. A099286.
%K A347151 nonn,cons
%O A347151 0,1
%A A347151 _Sean A. Irvine_, Aug 19 2021