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%I A004711 #28 Jan 21 2020 15:03:26
%S A004711 1,2,5,8,13,14,15,16,17,18,20,21,23,25,27,31,35,40,42,43,45,49,50,55,
%T A004711 59,60,62,65,66,70,73,74,78,79,82,83,87,89,93,95,96,97,105,106,108,
%U A004711 109,110,116,117,118,121,122,124
%N A004711 Positions of 1's in binary expansion of Pi/4.
%H A004711 T. D. Noe, <a href="/A004711/b004711.txt">Table of n, a(n) for n = 1..1000</a>
%F A004711 a(n) = A256108(n) + 2. - _Lorenzo Sauras Altuzarra_, Jan 21 2020
%t A004711 Flatten[Position[RealDigits[Pi/4,2,150][[1]],1]] (* _Harvey P. Dale_, Jul 13 2015 *)
%o A004711 (PARI) default(realprecision, 100); select(x->(x==1), binary(Pi/4)[2], 1) \\ _Michel Marcus_, Oct 11 2018
%Y A004711 Cf. A003881, A004601, A256108.
%K A004711 nonn,base
%O A004711 1,2
%A A004711 _Simon Plouffe_

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