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 A346191 #7 Jan 14 2023 13:27:56
%S A346191 1,1,2,5,0,3,0,5,1,7,5,7,8,1,2,5,0,0,0,1,0,8,4,2,0,2,1,7,2,4,8,5,5,0,
%T A346191 4,4,3,4,0,0,7,4,5,2,8,0,0,8,6,9,9,4,1,7,1,1,4,2,5,7,8,1,2,5,0,0,0,0,
%U A346191 0,0,0,0,0,0,0,0,0,1,7,2,7,2,3,3,7,1,1,0,1,8,8,8,8,9,2,5,0,7,7,2
%N A346191 Decimal expansion of Sum_{k>=0} 1/(2^(2^(2*k)) - 1).
%C A346191 This constant is transcendental (Schwarz, 1967).
%H A346191 Wolfgang Schwarz, <a href="https://www.jstor.org/stable/24489854">Remarks on the irrationality and transcendence of certain series</a>, Mathematica Scandinavica, Vol. 20, No. 2 (1967), pp. 269-274; <a href="https://www.mscand.dk/article/download/10836/8857">alternative link</a>.
%H A346191 <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>
%F A346191 Equals A076214 - A346190.
%e A346191 1.12503051757812500010842021724855044340074528008699...
%t A346191 RealDigits[Sum[1/(2^(2^(2*n) - 1)), {n, 0, 10}], 10, 100][[1]]
%Y A346191 Cf. A048649, A076214, A346190, A346192.
%K A346191 nonn,cons
%O A346191 1,3
%A A346191 _Amiram Eldar_, Jul 09 2021