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A086416 Number of divisors of 3-smooth numbers. 2
1, 2, 2, 3, 4, 4, 3, 6, 5, 6, 8, 4, 6, 9, 10, 8, 7, 12, 5, 12, 12, 8, 15, 10, 14, 16, 6, 9, 18, 15, 16, 20, 12, 10, 21, 20, 7, 18, 24, 18, 11, 24, 25, 14, 20, 28, 24, 12, 8, 27, 30, 21, 22, 32, 30, 13, 16, 30, 35, 28, 24, 9, 36, 36, 14, 24, 33, 40, 35, 26, 18, 40, 42, 15, 32 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) = A000005(A003586(n));

a(n) = if A086414(n)=A086415(n) then A086414(n)+1 else (A086414(n)+1)*(A086415(n)+1);

a(n) = (A022328(n)+1)*(A022329(n)+1).

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 1..10000

CROSSREFS

Cf. A086417.

Cf. A000005, A003586, A022328, A022329.

Sequence in context: A243220 A085430 A246794 * A168148 A147968 A065167

Adjacent sequences:  A086413 A086414 A086415 * A086417 A086418 A086419

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Jul 18 2003

STATUS

approved

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Last modified December 9 04:36 EST 2016. Contains 278960 sequences.