1,2

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.

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

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

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.

Cf. A000005, A025487, A181815.

Sequence in context: A320348 A145394 A179806 * A173997 A029143 A153846

Adjacent sequences: A182759 A182760 A182761 * A182763 A182764 A182765

nonn

Matthew Vandermast, Nov 30 2010

approved