A182762 Number of ordered factorizations of A025487(n) as A025487(j) * A025487(k).

1, 2, 3, 2, 4, 4, 5, 6, 2, 6, 3, 8, 4, 7, 6, 10, 6, 8, 9, 4, 12, 2, 4, 8, 9, 12, 8, 14, 4, 8, 10, 10, 15, 12, 16, 6, 12, 3, 12, 11, 6, 18, 4, 5, 16, 18, 8, 16, 6, 14, 12, 12, 21, 2, 8, 10, 20, 20, 10, 20, 9, 16, 13, 18, 24

Offset

1,2

Comments

A025487(j) and A025487(k) need not be distinct.

Because multiplying two members of A025487 always produces a member of A025487, the value of this function for all nonmembers of A025487 is 0.

Links

Amiram Eldar, Table of n, a(n) for n = 1..10000

Formula

a(n) = A000005(A181815(n)).

Example

36 has three different ordered factorizations into two members of A025487 (36 = 1*36 = 6*6 = 36*1). Therefore, since 36 = A025487(11), a(11) = 3.

Crossrefs

Cf. A000005, A025487, A181815.

Sequence in context: A145394 A179806 A364346 * A173997 A029143 A363263

Adjacent sequences: A182759 A182760 A182761 * A182763 A182764 A182765

Keyword

nonn

Author

Matthew Vandermast, Nov 30 2010

Status

approved