A004711 Positions of 1's in binary expansion of Pi/4.

1, 2, 5, 8, 13, 14, 15, 16, 17, 18, 20, 21, 23, 25, 27, 31, 35, 40, 42, 43, 45, 49, 50, 55, 59, 60, 62, 65, 66, 70, 73, 74, 78, 79, 82, 83, 87, 89, 93, 95, 96, 97, 105, 106, 108, 109, 110, 116, 117, 118, 121, 122, 124

Offset

1,2

Links

T. D. Noe, Table of n, a(n) for n = 1..1000

Formula

a(n) = A256108(n) + 2. - Lorenzo Sauras Altuzarra, Jan 21 2020

Mathematica

Flatten[Position[RealDigits[Pi/4, 2, 150][[1]], 1]] (* Harvey P. Dale, Jul 13 2015 *)

Prog

(PARI) default(realprecision, 100); select(x->(x==1), binary(Pi/4)[2], 1) \\ Michel Marcus, Oct 11 2018

Crossrefs

Cf. A003881, A004601, A256108.

Sequence in context: A053614 A373640 A354007 * A291922 A000789 A178752

Adjacent sequences: A004708 A004709 A004710 * A004712 A004713 A004714

Keyword

nonn,base

Author

Simon Plouffe

Status

approved