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%I #12 Jul 31 2019 19:05:11
%S 20,39,52,55,63,64,68,73,79,86,89,121,123,130,131,132,153,175,183,184,
%T 192,194,197,206,214,224,229,230,231,236,239,246,248,269,270,290,308,
%U 315,349,350,352,382,389,407,410
%N Positions of 2's in the decimal expansion of (1 + sqrt(5))/2.
%H G. C. Greubel, <a href="/A054288/b054288.txt">Table of n, a(n) for n = 1..1000</a>
%t Flatten[Position[RealDigits[(Sqrt[5]+1)/2,10,1000][[1]],2]] (* _Harvey P. Dale_, Oct 30 2014 *)
%Y Cf. A001622.
%K nonn,base
%O 1,1
%A _Simon Plouffe_, Feb 20 2000