A164104 - OEIS

%I #9 Sep 28 2022 14:11:43

%S 2,6,3,1,8,9,4,5,0,6,9,5,7,1,6,2,2,9,8,3,5,5,8,6,4,2,6,6,6,3,3,6,4,0,

%T 3,0,2,7,5,0,3,1,9,8,4,1,9,3,0,8,7,7,5,0,0,3,7,6,8,9,3,1,6,6,9,9,2,0,

%U 1,1,9,5,2,6,4,5,1,2,1,3,9,8,1,3,3,8,0,6,2,4,0,9,9,1,6,1,3,9,2,8,4,8,6,4,0

%N Decimal expansion of 8*Pi^2/3.

%C Surface area of the 5-dimensional unit sphere.

%H G. C. Greubel, <a href="/A164104/b164104.txt">Table of n, a(n) for n = 2..5000</a>

%H Eric Weisstein, <a href="http://mathworld.wolfram.com/Hypersphere.html">Hypersphere</a>, Wolfram Mathworld.

%H Wikipedia, <a href="http://en.wikipedia.org/wiki/Hypersphere">Hypersphere</a>

%H <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>

%F Equals 5*A164103 = 10 * A019699 * A019692.

%e Equals 26.318945069571622983558642666336...

%t RealDigits[8*Pi^2/3, 10, 50][[1]] (* _G. C. Greubel_, Sep 11 2017 *)

%o (PARI) 8*Pi^2/3 \\ _G. C. Greubel_, Sep 11 2017

%Y Cf. A019692, A019694, A164102, A091925, A164107, A164109.

%K cons,nonn

%O 2,1

%A _R. J. Mathar_, Aug 10 2009

%E A-number in formula corrected by _R. J. Mathar_, Aug 12 2010