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 A333419 #16 May 31 2023 04:26:40 %S A333419 5,2,0,4,9,9,8,7,7,8,1,3,0,4,6,5,3,7,6,8,2,7,4,6,6,5,3,8,9,1,9,6,4,5, %T A333419 2,8,7,3,6,4,5,1,5,7,5,7,5,7,9,6,3,7,0,0,0,5,8,8,0,5,7,2,5,6,4,7,1,9, %U A333419 3,5,2,1,7,1,6,8,5,3,5,7,0,9,1,4,7,8,8,2,1,8,7,3,4,7,8,7,7,5,7,0,3,2,9,6,6 %N A333419 Decimal expansion of the error function at 1/2, erf(1/2). %H A333419 Alois P. Heinz, <a href="/A333419/b333419.txt">Table of n, a(n) for n = 0..10000</a> %H A333419 Wikipedia, <a href="https://en.wikipedia.org/wiki/Error_function">Error Function</a>. %e A333419 0.5204998778130465376827466538919645287364515757579637... %p A333419 evalf(erf(1/2), 140); # _Alois P. Heinz_, Mar 20 2020 %t A333419 RealDigits[Erf[1/2], 10, 120][[1]] (* _Amiram Eldar_, May 31 2023 *) %o A333419 (PARI) 1 - erfc(1/2) \\ _Michel Marcus_, Mar 21 2020 %Y A333419 Cf. A099286 (erf(1)). %K A333419 nonn,cons %O A333419 0,1 %A A333419 _Sean A. Irvine_, Mar 20 2020