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 A087500 #10 Feb 16 2025 08:32:51
%S A087500 1,0,9,1,8,7,7,0,4,1,2,0,9,6,1,2,6,7,8,2,7,6,1,1,0,9,7,9,4,7,7,6,3,8,
%T A087500 2,5,6,4,9,3,2,7,2,6,5,1,4,2,9,6,5,6,2,7,2,7,1,0,7,5,4,9,1,3,5,6,9,7,
%U A087500 3,5,1,3,9,7,0,7,2,9,8,9,0,6,3,3,6,6,6,5,3,0,6,6,5,4,4,9,4,0,9,2
%N A087500 Decimal expansion of Khinchin mean K_{-10}.
%C A087500 Khinchin's constant is K_0.
%H A087500 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/KhinchinsConstant.html">Khinchin's Constant</a>
%e A087500 1.09187704...
%t A087500 m = 10; digits = 100; exactEnd = 1000; f[n_] = -(Log[1 - (1 + n)^(-2)]/(n^m*Log[2])); s[n_] = Series[f[n], {n, Infinity, digits}] // Normal // N[#, digits]&; exactSum = Sum[f[n], {n, 1, exactEnd}] // N[#, digits]&; extraSum = Sum[s[n], {n, exactEnd + 1, Infinity}] // N[#, digits]&; (exactSum + extraSum)^(-1/m) // RealDigits[#, 10, digits]& // First (* _Jean-François Alcover_, Feb 14 2013 *)
%Y A087500 Cf. A002210, A087491, A087492, A087493, A087494, A087495, A087496, A087497, A087498, A087499, A087500.
%K A087500 nonn,cons
%O A087500 1,3
%A A087500 _Eric W. Weisstein_, Sep 09 2003
%E A087500 More terms from _Jean-François Alcover_, Feb 14 2013