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A217018 Partial sums of 3-almost primes which are again 3-almost primes, i.e., have exactly 3 not necessarily distinct prime factors. 1
8, 20, 964, 1825, 2074, 2637, 3614, 3786, 4503, 5283, 5495, 6414, 6652, 7138, 7383, 9485, 9764, 10330, 10615, 11191, 12427, 12749, 13074, 15475, 16195, 16930, 18446, 19233, 20855, 22108, 22959, 23387, 28273, 28747, 29222, 30676, 32695, 34798, 35871 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Bigomega=3 analog of the semiprime version A092190. In sequence A086062 it was asked whether there are infinitely many such numbers.
LINKS
FORMULA
A217018 = A086062 intersect A014612.
PROG
(PARI) A217018(n, list=0, N=0, S=0)={until(!n--, until(bigomega(S+=N)==3, until(bigomega(N++)==3, )); list&print1(S", ")); S} \\ - M. F. Hasler, Sep 29 2012
CROSSREFS
Sequence in context: A230987 A060668 A221067 * A108235 A130021 A003864
KEYWORD
nonn
AUTHOR
M. F. Hasler, Sep 23 2012
STATUS
approved

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Last modified March 28 05:39 EDT 2024. Contains 371235 sequences. (Running on oeis4.)