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 A372719 #11 May 13 2024 14:06:14
%S A372719 1,2,8,0,6,3,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
%T A372719 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
%U A372719 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9
%N A372719 Decimal expansion of Sum_{k >= 1} floor(k*e^(Pi*sqrt(163/9)))/2^k.
%H A372719 J. M. Borwein and P. B. Borwein, <a href="https://doi.org/10.2307/2324993">Strange Series and High Precision Fraud</a>, The American Mathematical Monthly, Vol. 99, No. 7 (1992), pp. 622-640.
%F A372719 Approximately 1280640, correct to at least half a billion digits: see Sum 10 in Borwein and Borwein (1992), p. 623.
%e A372719 1280639.9999999999999999999999999999999999999999999999999999...
%t A372719 First[RealDigits[Sum[Floor[k*E^(Pi*Sqrt[163/9])]/2^k, {k, 400}], 10, 100]]
%Y A372719 Cf. A000796, A001113, A038152, A190575, A039661.
%K A372719 nonn
%O A372719 7,2
%A A372719 _Paolo Xausa_, May 11 2024