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.

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

Offset

0,2

Links

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

Crossrefs

Cf. A085892, A085893.

Sequence in context: A182804 A242695 A319473 * A354468 A309194 A330640

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