A123557 a(n) = A064688(n) - 1.

0, 1, 2, 4, 11, 17, 37, 53, 103, 255, 339, 759, 1259, 1609, 2589, 5119, 9791, 12075, 22249, 32991, 40025, 70487, 101697, 173681, 345855, 483329, 570077, 789639, 927405, 1274117, 3725409, 5010687, 7755775, 8953855, 18108417, 20792119

Offset

1,3

Comments

This is the number of partitions of the n-th prime p into distinct odd parts that are less than p.

Links

G. C. Greubel, Table of n, a(n) for n = 1..1000

Example

a(4)=4 because the fourth prime (7) can be written in four different ways {6+1, 5+2, 4+3, 1+2+4}.

Mathematica

Table[PartitionsQ[Prime[n]] - 1, {n, 50}] (* G. C. Greubel, Oct 15 2017 *)

Crossrefs

Cf. A064688.

Sequence in context: A216554 A018625 A360401 * A283134 A283216 A283293

Adjacent sequences: A123554 A123555 A123556 * A123558 A123559 A123560

Keyword

nonn

Author

N. J. A. Sloane, based on email from Anthony Doran, Nov 18 2006

Status

approved