%I #40 Mar 23 2022 11:10:44
%S 1,0,0,0,1,0,0,1,0,1,0,1,0,1,0,0,1,0,1,0,1,0,0,0,0,0,0,0,0,0,0,0,1,0,
%T 0,1,0,0,0,0,1,0,1,0,1,0,0,0,0,0,0,0,0,1,0,0,0,0,1,0,0,0,0,0,1,0,0,0,
%U 0,1,0,0,1,0,1,0,0,1,0,0,0,1,0,0,1,0,1,0,0,1,0,0,0,1,0,0,0,1,0,0,1,0,0,0,0,0,0,1,0,1,0
%N Expansion of 4/sqrt(phi) in base phi, where phi=(1+sqrt(5))/2.
%C 4/sqrt(phi) = 3.14460551102... is an approximation to Pi obtained by dividing a square into 16 parts.
%e sqrt(16/((sqrt(5)+1)/2)) = 10.00100101010100101010000000000010010000101010000000010000100000\
%e 10000100101001000100101001000100010010000001010... in base phi.
%t RealDigits[Sqrt[16/GoldenRatio], GoldenRatio, 111][[1]]
%Y Cf. A202142.
%K base,cons,nonn
%O 2,1
%A Ville Takio, Dec 11 2011
%E Entry revised by _N. J. A. Sloane_, Dec 12 2011 and Apr 03 2016.