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A028422 Number of ways n can be properly factored. 14
0, 0, 0, 1, 0, 1, 0, 2, 1, 1, 0, 3, 0, 1, 1, 4, 0, 3, 0, 3, 1, 1, 0, 6, 1, 1, 2, 3, 0, 4, 0, 6, 1, 1, 1, 8, 0, 1, 1, 6, 0, 4, 0, 3, 3, 1, 0, 11, 1, 3, 1, 3, 0, 6, 1, 6, 1, 1, 0, 10, 0, 1, 3, 10, 1, 4, 0, 3, 1, 4, 0, 15, 0, 1, 3, 3, 1, 4, 0, 11, 4, 1, 0, 10, 1, 1, 1, 6, 0, 10 (list; graph; refs; listen; history; internal format)
OFFSET

1,8

EXAMPLE

12 can be expressed as 2*6, 3*4 or 2*2*3, so a(12)=3.

CROSSREFS

A001055(n) - 1.

Sequence in context: A114206 A073202 A055212 * A064577 A113949 A152434

Adjacent sequences:  A028419 A028420 A028421 * A028423 A028424 A028425

KEYWORD

nonn

AUTHOR

Glen Burch (gburch(AT)erols.com)

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Last modified February 15 17:45 EST 2012. Contains 205833 sequences.