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%I #27 May 31 2021 03:24:28
%S 1,0,0,0,0,0,0,4,7,6,9,3,2,9,8,6,7,8,7,8,0,6,4,6,3,1,1,6,7,1,9,6,0,4,
%T 3,7,3,0,4,5,9,6,6,4,4,6,6,9,4,7,8,4,9,3,7,6,0,0,2,0,7,4,8,7,3,7,6,5,
%U 9,6,8,3,9,0,8,7,8,9,8,1,5,9,8,3,3,8,7,6,6
%N Decimal expansion of zeta(21).
%C Web searches find 1.0000004769329867878 in Python tools. Simon Plouffe published 1000 digits for zeta(9) up to zeta(2051) many years ago.
%H Simon Plouffe, <a href="http://plouffe.fr/simon/constants/zeta9to2051.txt">Zeta(9) to Zeta(2051) in reverse order to 1000 digits each</a>.
%H Simon Plouffe, <a href="/A293904/a293904.txt">Zeta(9) to Zeta(2051) in reverse order to 1000 digits each</a>. [Cached copy, with permission]
%H Simon Plouffe, <a href="/A293904/a293904_4096.gz">Zeta(2) to Zeta(4096) to 2048 digits each</a>. (gzipped file)
%H Simon Plouffe, <a href="http://plouffe.fr/simon/identities.html">Identities inspired from Ramanujan Notebooks II</a>, July 21, 1998.
%e 1.000000476932986787806...
%t RealDigits[Zeta[21], 10, 100][[1]] (* _Amiram Eldar_, May 31 2021 *)
%Y Cf. A013661, A002117, A013662, A013663, A013664, A013665, A013666, A013667, A013668, A013669, A013670, A013671, A013672, A013673, A013674, A013675, A013676, A013677, A013678.
%K nonn,cons
%O 1,8
%A _Frank Ellermann_, Oct 19 2017
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