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%I #31 Apr 28 2024 11:49:01
%S 4,0,4,5,0,8,4,9,7,1,8,7,4,7,3,7,1,2,0,5,1,1,4,6,7,0,8,5,9,1,4,0,9,5,
%T 2,9,4,3,0,0,7,7,2,9,4,9,5,1,4,4,0,7,1,5,5,3,3,8,6,2,1,5,5,6,7,6,3,1,
%U 5,1,1,5,7,0,4,7,2,5,6,1,2,4,2,6,8,0
%N Decimal expansion of (1 + sqrt(5))/8, the golden ratio divided by 4.
%C Area of quadrilateral with side lengths (sqrt(5)+1)/4, (sqrt(5)-1)/4, 1/2, 1. [And what angles? - _N. J. A. Sloane_, Apr 28 2024]
%e 0.404508497187...
%p Digits:=100: evalf((1+sqrt(5))/8); # _Wesley Ivan Hurt_, Sep 08 2014
%t RealDigits[(1 + Sqrt[5])/8, 10, 100][[1]] (* _Wesley Ivan Hurt_, Sep 08 2014 *)
%o (PARI) a(n)=floor(10^n*(1+sqrt(5))/8)%10 \\ _Edward Jiang_, Sep 07 2014
%Y Cf. A001622, A019863.
%K cons,nonn,easy
%O 0,1
%A _Omar E. Pol_, Nov 15 2007
%E Edited by _N. J. A. Sloane_, Apr 28 2024
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