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A095683 Number of prime power divisors of n. If n=product p_i^r_i then d=product {p_i^s_i, 2<=s_i<=r_i, s_i is prime} is a prime power divisor of n. 1
1, 0, 0, 1, 0, 0, 0, 2, 1, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 2, 0, 0, 0, 0, 3, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,8

LINKS

Table of n, a(n) for n=1..105.

FORMULA

Multiplicative with a(p^e) = A000720(e). - Vladeta Jovovic, Jul 06 2004

EXAMPLE

n=16: prime power divisors of 16 are {2^2, 2^3}, so a(16)=2.

CROSSREFS

Sequence in context: A124749 A127844 A017877 * A219481 A074079 A037858

Adjacent sequences:  A095680 A095681 A095682 * A095684 A095685 A095686

KEYWORD

nonn,mult

AUTHOR

Yasutoshi Kohmoto (zbi74583(AT)boat.zero.ad.jp)

EXTENSIONS

More terms from Vladeta Jovovic, Jul 06 2004

STATUS

approved

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Last modified June 18 02:55 EDT 2013. Contains 226328 sequences.