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A108602 Number of distinct prime factors of highly composite numbers (definition 1, A002182). 12
0, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 7, 7, 8, 8, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 8, 9, 8, 9, 8, 9, 9, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

n appears A086334(n) times. - Lekraj Beedassy, Sep 02 2006

LINKS

T. D. Noe, Table of n, a(n) for n = 1..10000 (using data from Flammenkamp)

A. Flammenkamp, Highly composite numbers

A. Flammenkamp, List of the first 1200 highly composite numbers

A. Flammenkamp, List of the first 779,674 highly composite numbers

FORMULA

a(n) = A001221(A002182(n)).

EXAMPLE

A002182(8) = 48 = 2^4*3, which has 2 distinct prime factors, so a(8)=2.

CROSSREFS

Cf. A002182, A002183.

Cf. A212182, A318490.

Sequence in context: A000196 A111850 A059396 * A305025 A085290 A108611

Adjacent sequences:  A108599 A108600 A108601 * A108603 A108604 A108605

KEYWORD

nonn

AUTHOR

Jud McCranie, Jun 12 2005

EXTENSIONS

Edited by Ray Chandler, Nov 11 2005

STATUS

approved

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Last modified October 23 17:32 EDT 2019. Contains 328373 sequences. (Running on oeis4.)