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A108504 Number of divisors of n that are at most sqrt(n) by prime signature. 1
1, 1, 2, 2, 2, 3, 3, 4, 4, 3, 5, 5, 6, 4, 6, 6, 8, 4, 8, 9, 7, 8, 8, 10, 5, 9, 12, 8, 12, 10, 12, 5, 11, 15, 9, 16, 12, 14, 14, 6, 16, 12, 18, 13, 18, 10, 20, 14, 18, 16, 6, 20, 14, 16, 24, 15, 21, 11, 24, 16, 23, 18, 7, 24, 15, 24, 30, 18, 24, 24, 12, 27, 25, 28, 18, 27, 32, 20, 18, 7 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..80.

FORMULA

a(n) = A038548(A025487(n)).

CROSSREFS

Sequence in context: A173752 A153847 A096036 * A036468 A028829 A130855

Adjacent sequences:  A108501 A108502 A108503 * A108505 A108506 A108507

KEYWORD

nonn

AUTHOR

Christian G. Bower, Jun 06 2005

EXTENSIONS

Offset corrected by Charles R Greathouse IV, Sep 28 2012

STATUS

approved

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Last modified November 19 03:37 EST 2019. Contains 329310 sequences. (Running on oeis4.)