A109831 Greatest number of primes < prime(n) forming an arithmetic progression such that also prime(n) is a term.

1, 1, 2, 2, 1, 2, 2, 3, 4, 2, 1, 3, 3, 2, 4, 3, 2, 2, 2, 2, 3, 3, 2, 3, 3, 3, 3, 2, 3, 4, 4, 2, 3, 3, 3, 5, 3, 3, 4, 2, 3, 3, 3, 4, 3, 2, 3, 4, 3, 3, 3, 3, 4, 5, 3, 3, 4, 2, 3, 4, 4, 3, 5, 3, 3, 3, 2, 3, 3, 5, 3, 3, 4, 2, 3, 4, 4, 3, 3, 3, 4, 3, 3, 3, 4, 4, 3, 3, 5, 3, 4, 3, 3, 2, 3, 5, 4, 3, 3, 3, 2, 3

Offset

2,3

Comments

a(n) = (A000040(n) - A109833(n)) / A109832(n).

Links

Table of n, a(n) for n=2..103.

Eric Weisstein's World of Mathematics, Prime Arithmetic Progression

Index entries for sequences related to primes in arithmetic progressions

Crossrefs

Sequence in context: A194848 A289497 A029328 * A247352 A097266 A226983

Adjacent sequences: A109828 A109829 A109830 * A109832 A109833 A109834

Keyword

nonn

Author

Reinhard Zumkeller, Jul 04 2005

Status

approved