A176246 a(n) = A001223(n+1) - 1.

1, 1, 3, 1, 3, 1, 3, 5, 1, 5, 3, 1, 3, 5, 5, 1, 5, 3, 1, 5, 3, 5, 7, 3, 1, 3, 1, 3, 13, 3, 5, 1, 9, 1, 5, 5, 3, 5, 5, 1, 9, 1, 3, 1, 11, 11, 3, 1, 3, 5, 1, 9, 5, 5, 5, 1, 5, 3, 1, 9, 13, 3, 1, 3, 13, 5, 9, 1, 3, 5, 7, 5, 5, 3, 5, 7, 3, 7, 9, 1, 9, 1, 5, 3, 5, 7, 3, 1, 3, 11, 7, 3, 7

Offset: 1

Author

Edmund Algeo, Apr 13 2010

Keywords

• nonn
• less

Comments

Previous name was: Numbers which added to an odd prime plus one, yield the next prime in the series for primes.

Essentially a duplicate of A046933 and A135732. - T. D. Noe, Oct 23 2013

Crossrefs

Cf. A046933 (number of composites between successive primes).

Programs

Mathematica

Differences[Prime[Range[2, 100]]] - 1 (* Paolo Xausa, Jul 02 2025 *)

Formula

a(n) = A001223(n+1) - 1. - Michel Marcus, Jun 08 2013

Extensions

New name using formula from Michel Marcus, Joerg Arndt, Oct 22 2013