A320985 Complement of A092855.

1, 4, 6, 8, 9, 10, 11, 12, 14, 15, 20, 21, 24, 25, 28, 29, 37, 38, 42, 47, 48, 51, 52, 54, 55, 57, 58, 59, 60, 62, 63, 64, 66, 69, 70, 72, 78, 81, 82, 83, 85, 86, 89, 92, 93, 96, 100, 102, 104, 106, 107, 109, 111, 113, 119, 121, 122, 128, 129, 130, 134, 136, 139

Offset: 1

Author

Jianing Song, Oct 27 2018

Keywords

• nonn
• base

Comments

Positions of 0 in the binary expansion of sqrt(2) after the radix point. With a prepended 0, A092855 gives the positions of 1.

Examples

			In binary, sqrt(2) is read as 1.0110101000001001111001... The 1st, 4th, 6th and 8th digits after the radix are 0's, so the first four terms are 1, 4, 6 and 8.
		

Links

• Paolo Xausa, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A004539, A092855.

Programs

Mathematica

PositionIndex[First[RealDigits[Sqrt[2], 2, 200, -1]]][0] (* Paolo Xausa, Aug 27 2024 *)

PARI

default(realprecision, 150); x=sqrt(2); for(n=1, 150, if(!(floor(x*2^n)%2),print1(n, ", ")))

PARI

Vec(select(x->(x==0), binary(sqrt(2))[2], 1)) \\ Michel Marcus, Oct 29 2018