login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A086052 Sum of first n 6-almost primes. 2
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 (list; graph; refs; listen; history; text; internal format)
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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 19 22:14 EDT 2019. Contains 325168 sequences. (Running on oeis4.)