A147777 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).

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, 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, 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

Offset

2,2

Links

Table of n, a(n) for n=2..100.

Example

15.999559340451767721751907049184120710006579401035621394712...

Mathematica

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 *)

Crossrefs

Cf. A147777.

Sequence in context: A147818 A345739 A055199 * A086731 A147776 A020846

Adjacent sequences: A147774 A147775 A147776 * A147778 A147779 A147780

Keyword

nonn,cons

Author

N. J. A. Sloane, May 03 2009, based on a posting to the Number Theory List by Nigel Boston, Apr 29 2009

Status

approved