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A085893 Group the natural numbers such that the product of the n-th group has n prime divisors. (1), (2), (3,4), (5,6,),(7,8,9,10),(11,12,13,14),(15,16,17,18,19,20,21),... Sequence contains the number of terms in the groups. 2
1, 1, 2, 2, 4, 4, 7, 7, 7, 8, 10, 12, 11, 13, 14, 15, 19, 16, 19, 18, 21, 19, 24, 24, 24, 26, 27, 28, 29, 31, 29, 33, 33, 35, 37, 37, 38, 38, 41, 39, 45, 44, 45, 44, 49, 47, 52, 48, 52, 52, 56, 52, 53, 60, 59, 58, 59, 65, 64, 61, 65, 63, 70, 70, 70, 68, 73, 75, 71, 76, 75, 79, 78 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..72.

CROSSREFS

Cf. A085892, A085894.

Sequence in context: A341949 A338333 A287144 * A341950 A230167 A060028

Adjacent sequences:  A085890 A085891 A085892 * A085894 A085895 A085896

KEYWORD

nonn

AUTHOR

Amarnath Murthy and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jul 10 2003

EXTENSIONS

More terms from Ray Chandler, Sep 13 2003

STATUS

approved

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Last modified April 13 01:36 EDT 2021. Contains 342934 sequences. (Running on oeis4.)