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 A371667 #21 Apr 11 2024 03:58:46
%S A371667 3,1,6,5,0,4,1,1,4,2,0,3,1,2,6,7,8,6,8,9,3,7,5,4,6,2,0,7,5,3,8,6,2,8,
%T A371667 1,5,6,6,9,0,8,5,9,4,3,3,8,7,9,9,6,6,4,0,5,4,3,6,1,8,8,0,5,5,0,8,0,7,
%U A371667 5,7,9,9,6,5,6,0,0,9,6,4,9,4,5,6,2,4,7,7,5,7,9,9,6,5,1,5,4,6,3,7,1,0,8
%N A371667 Decimal expansion of -Ei(-1) / log(2).
%F A371667 Equals Integral_{x=0..oo} exp(-2^x) dx.
%e A371667 0.316504114203126786893754620753862815669085943...
%t A371667 RealDigits[-ExpIntegralEi[-1]/Log[2], 10, 103][[1]]
%o A371667 (PARI) eint1(1)/log(2) \\ _Michel Marcus_, Apr 11 2024
%Y A371667 Cf. A007525, A019704, A099285, A232734.
%K A371667 nonn,cons
%O A371667 0,1
%A A371667 _Ilya Gutkovskiy_, Apr 10 2024