A086052 - OEIS

A086052

Sum of first n 6-almost primes.

64, 160, 304, 464, 680, 904, 1144, 1468, 1804, 2156, 2516, 2916, 3332, 3818, 4322, 4850, 5390, 5934, 6494, 7094, 7702, 8326, 9055, 9791, 10547, 11331, 12123, 12933, 13749, 14589, 15469, 16369, 17281, 18209, 19145, 20137, 21137, 22177, 23281

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OFFSET

1,1

COMMENTS

The first two elements in this sequence are themselves 6-almost primes. a(1) = 64 = 2^6. a(2) = 160 = 2^5 * 5. - Jonathan Vos Post, Dec 11 2004

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

EXAMPLE

a(2)=160 because sum of first two 6-almost primes, i.e. 64+96, is 160.

MAPLE

ListTools:-PartialSums(select(numtheory:-bigomega=6, [$1..2000])); # Robert Israel, Jun 28 2019

MATHEMATICA

Accumulate[Select[Range[1500], PrimeOmega[#]==6&]] (* Harvey P. Dale, May 15 2013 *)

CROSSREFS

Partial sums of A046306.

Sequence in context: A044696 A235120 A195233 * A044396 A044777 A251077

Adjacent sequences: A086049 A086050 A086051 * A086053 A086054 A086055

KEYWORD

easy,nonn

AUTHOR

Shyam Sunder Gupta, Aug 24 2003

STATUS

approved