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

1,3

Comments

First differences of A144119.

Links

Table of n, a(n) for n=1..42.

Formula

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

Crossrefs

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

Sequence in context: A039898 A083690 A241824 * A240576 A060312 A218934

Adjacent sequences: A144118 A144119 A144120 * A144122 A144123 A144124

Keyword

easy,nonn

Author

Omar E. Pol, Sep 11 2008

Status

approved