A068323 a(n)=number of arithmetic progressions of primes, nondecreasing with sum n.

0, 1, 1, 1, 2, 2, 2, 2, 2, 3, 1, 3, 2, 3, 4, 3, 1, 4, 2, 4, 4, 4, 1, 5, 2, 4, 1, 4, 1, 6, 2, 3, 5, 5, 2, 6, 1, 3, 5, 5, 1, 7, 2, 5, 3, 5, 1, 7, 2, 6, 5, 5, 1, 7, 3, 6, 3, 5, 1, 9, 2, 4, 3, 6, 2, 9, 1, 4, 6, 8, 1, 8, 2, 6, 3, 7, 2, 10, 1, 7, 2, 6, 1, 11, 4, 6

Offset: 1

Author

Naohiro Nomoto, Feb 27 2002

Keywords

• easy
• nonn

Extensions

More terms from Sean A. Irvine, Feb 09 2024