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%I #5 Mar 07 2013 05:00:28
%S 1,5,9,9,9,5,5,9,3,4,0,4,5,1,7,6,7,7,2,1,7,5,1,9,0,7,0,4,9,1,8,4,1,2,
%T 0,7,1,0,0,0,6,5,7,9,4,0,1,0,3,5,6,2,1,3,9,4,7,1,2,3,1,6,8,9,5,0,1,1,
%U 7,3,8,4,4,9,7,1,5,4,1,8,0,8,6,8,0,6,1,7,2,7,9,4,1,3,4,5,7,6,9
%N Decimal expansion of 4+2k, where k = z^(-3)+z^(-2)+z^(-1)+1+z+z^2+z^3 and z = exp(2*Pi*I/23).
%e 15.999559340451767721751907049184120710006579401035621394712...
%t 6 + 4*Cos[2*Pi/23] + 4*Cos[4*Pi/23] + 4*Sin[11*Pi/46] // RealDigits[#, 10, 99]& // First (* _Jean-François Alcover_, Mar 07 2013 *)
%Y Cf. A147777.
%K nonn,cons
%O 2,2
%A _N. J. A. Sloane_, May 03 2009, based on a posting to the Number Theory List by Nigel Boston, Apr 29 2009
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