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%I #16 Jul 05 2024 02:25:15
%S 1,2,3,4,5,6,7,9,0,1,2,2,3,4,5,6,7,9,0,1,2,3,4,4,5,6,7,9,0,1,2,3,4,5,
%T 6,6,7,9,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,9,0,1,1,2,3,4,5,6,7,9,0,
%U 1,2,3,3,4,5,6,7,9,0,1,2,3,4,5,5,6,7,9,0,1,2
%N Decimal expansion of Sum_{k >= 1} A372822(k)/10^k.
%H Paolo Xausa, <a href="/A374323/b374323.txt">Table of n, a(n) for n = -1..10000</a>
%H David H. Bailey and Jonathan M. Borwein, <a href="https://www.ams.org/notices/200505/fea-borwein.pdf">Experimental Mathematics: Examples, Methods and Implications</a>, Notices of the American Mathematical Society, May 2005, Vol. 52, No. 5, p. 511.
%H Jonathan M. Borwein, <a href="https://doi.org/10.1007/s10758-005-5216-x">The Experimental Mathematician: the Pleasure of Discovery and the Role of Proof</a>, International Journal of Computers for Mathematical Learning, Vol. 10 (2005), p. 98.
%F Approximately 1/81, correct to 13 digits.
%e 0.0123456790122345679012344567901234566790123456789012345679...
%t First[RealDigits[Sum[Floor[k*Tanh[Pi/2]]/10^k, {k, 150}], 10, 100]]
%Y Cf. A367960, A372822.
%K nonn,cons
%O -1,2
%A _Paolo Xausa_, Jul 04 2024