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A085894 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 first terms of every group. 2
1, 2, 3, 5, 7, 11, 15, 22, 29, 36, 44, 54, 66, 77, 90, 104, 119, 138, 154, 173, 191, 212, 231, 255, 279, 303, 329, 356, 384, 413, 444, 473, 506, 539, 574, 611, 648, 686, 724, 765, 804, 849, 893, 938, 982, 1031, 1078, 1130, 1178, 1230, 1282, 1338, 1390, 1443 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..53.

CROSSREFS

Cf. A085892, A085893.

Sequence in context: A182804 A242695 A319473 * A309194 A330640 A319474

Adjacent sequences:  A085891 A085892 A085893 * A085895 A085896 A085897

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 May 18 05:01 EDT 2021. Contains 343994 sequences. (Running on oeis4.)