A144121 Number of nonprime parts in the last section of the set of partitions of n.

1, 1, 2, 4, 5, 9, 12, 20, 26, 39, 51, 76, 96, 136, 175, 241, 304, 412, 517, 686, 859, 1117, 1392, 1794, 2217, 2818, 3478, 4373, 5363, 6694, 8168, 10113, 12295, 15105, 18289, 22347, 26932, 32712, 39302, 47481, 56825, 68347

Offset: 1

Author

Omar E. Pol, Sep 11 2008

Keywords

• easy
• nonn

Comments

First differences of A144119.

Crossrefs

Cf. A018252, A135010, A138121, A138137, A144117, A144118, A144119, A144120.

Formula

a(n) = A138137(n)-A144120(n) = A144119(n)-A144119(n-1).