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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.
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%I #7 Aug 25 2014 11:42:16

%S 1,2,3,5,7,11,15,22,29,36,44,54,66,77,90,104,119,138,154,173,191,212,

%T 231,255,279,303,329,356,384,413,444,473,506,539,574,611,648,686,724,

%U 765,804,849,893,938,982,1031,1078,1130,1178,1230,1282,1338,1390,1443

%N 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.

%Y Cf. A085892, A085893.

%K nonn

%O 0,2

%A _Amarnath Murthy_ and Meenakshi Srikanth (menakan_s(AT)yahoo.com), Jul 10 2003

%E More terms from _Ray Chandler_, Sep 13 2003