A068320 a(n)=number of arithmetic progressions of primes, strictly increasing with sum n.

0, 1, 1, 0, 2, 0, 2, 1, 1, 1, 1, 1, 2, 1, 2, 2, 1, 2, 2, 2, 2, 2, 1, 3, 1, 2, 0, 2, 1, 3, 2, 2, 3, 3, 0, 4, 1, 1, 3, 3, 1, 4, 2, 3, 1, 3, 1, 5, 1, 4, 3, 3, 1, 5, 1, 4, 1, 3, 1, 6, 2, 2, 1, 5, 0, 6, 1, 2, 4, 5, 1, 6, 2, 4, 1, 5, 0, 7, 1, 5, 1, 4, 1, 8, 2, 4, 3, 4, 1, 9, 1, 5, 2, 4, 0, 7, 1

Offset

1,5

Links

Table of n, a(n) for n=1..97.

Crossrefs

Sequence in context: A280008 A135220 A347550 * A111330 A225152 A117447

Adjacent sequences: A068317 A068318 A068319 * A068321 A068322 A068323

Keyword

easy,nonn

Author

Naohiro Nomoto, Feb 27 2002

Status

approved