login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A086295 Sum of all prime factors of 7-smooth numbers. 2
0, 2, 3, 4, 5, 5, 7, 6, 6, 7, 7, 9, 8, 8, 8, 9, 10, 9, 10, 9, 11, 10, 10, 12, 10, 11, 12, 11, 11, 14, 12, 11, 13, 12, 13, 12, 14, 12, 13, 13, 12, 14, 13, 13, 16, 14, 15, 13, 15, 14, 15, 15, 14, 14, 16, 14, 17, 15, 15, 14, 16, 17, 15, 16, 15, 18, 16, 17, 15, 17, 16, 16 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
FORMULA
a(n) = A001414(A002473(n)).
MATHEMATICA
sumPrimes[1] = 0; sumPrimes[n_] := Plus @@ Times @@@ FactorInteger[n]; sumPrimes/@Select[Range[500], Max[Transpose[FactorInteger[#]][[1]]] <= 7 &] (* Amiram Eldar, Jan 06 2020 *)
CROSSREFS
Sequence in context: A338038 A112264 A118503 * A360269 A345423 A159303
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Jul 15 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 19 03:33 EDT 2024. Contains 370952 sequences. (Running on oeis4.)