A162720 A014499 represented in binary.

1, 10, 10, 11, 11, 11, 10, 11, 100, 100, 101, 11, 11, 100, 101, 100, 101, 101, 11, 100, 11, 101, 100, 100, 11, 100, 101, 101, 101, 100, 111, 11, 11, 100, 100, 101, 101, 100, 101, 101, 101, 101, 111, 11, 100, 101, 101, 111, 101, 101, 101, 111, 101, 111, 10

Offset

1,2

Links

Andrew Howroyd, Table of n, a(n) for n = 1..1000

Formula

a(n) = A007088(A014499(n)). - Andrew Howroyd, Nov 08 2019

Example

The 5th prime number is 11. The binary representation of 11 is 1011. There are 3 "1s" in 1011. 3 in binary is 11, so a(5)=3.

Prog

(PARI) a(n)={fromdigits(digits(hammingweight(prime(n)), 2))} \\ Andrew Howroyd, Nov 08 2019

Crossrefs

Cf. A007088, A014499.

Sequence in context: A341722 A229902 A004209 * A112867 A215511 A280105

Adjacent sequences: A162717 A162718 A162719 * A162721 A162722 A162723

Keyword

base,nonn

Author

Ben Branman, Jul 11 2009

Extensions

Terms a(32) and beyond from Andrew Howroyd, Nov 08 2019

Status

approved