A057334 In A000120, replace each entry k with the k-th prime and replace 0 with 1.

1, 2, 2, 3, 2, 3, 3, 5, 2, 3, 3, 5, 3, 5, 5, 7, 2, 3, 3, 5, 3, 5, 5, 7, 3, 5, 5, 7, 5, 7, 7, 11, 2, 3, 3, 5, 3, 5, 5, 7, 3, 5, 5, 7, 5, 7, 7, 11, 3, 5, 5, 7, 5, 7, 7, 11, 5, 7, 7, 11, 7, 11, 11, 13, 2, 3, 3, 5, 3, 5, 5, 7, 3, 5, 5, 7, 5, 7, 7, 11, 3, 5, 5, 7

Offset: 0

Author

Alford Arnold, Aug 27 2000

Keywords

• easy
• nonn

Links

• Michael Gilleland, Some Self-Similar Integer Sequences

Crossrefs

Cf. A000040, A000120, A008578, A055932, A057335.

Programs

PARI

a(n) = if (n==0, 1, prime(hammingweight(n))); \\ Michel Marcus, Feb 08 2014

Formula

a(n) = A000040(A000120(n)) for n>0.

a(n) = A008578(1 + A000120(n)). - Alois P. Heinz, Nov 03 2024

Extensions

More terms from Michel Marcus, Feb 08 2014