A237192 - OEIS

%I #13 Feb 05 2014 03:27:15

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

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

%U 6,2,6,9,3,6,1,4,6,8,1,5,7,8,1

%N Decimal expansion of 2^i + 2^(-i), where i = sqrt(-1).

%C Approximately equals 1/2*(1+2^(2/3))*2^(1/4) = 1.538477870...

%F Equals 2*cos(log(2)). [_Bruno Berselli_, Feb 05 2014]

%e 1.53847780272794425315665998732254140288179198982392770633974301485816...

%t RealDigits[ Chop[ N[ 2^I + 2^(-I), 111], 10^-110], 10, 111]

%Y Cf. A237193.

%K nonn,cons,easy

%O 1,2

%A _Robert G. Wilson v_, Feb 04 2014