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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A153730 a(n) = Sum_{m=1..n} A153452(m). 1
1, 2, 3, 4, 5, 7, 8, 9, 11, 14, 15, 18, 19, 23, 28, 29, 30, 35, 36, 42, 51, 56, 57, 61, 66, 72, 77, 87, 88, 104, 105, 106, 120, 127, 141, 150, 151, 159, 179, 189, 190, 225, 226, 241, 262, 271, 272, 277, 291, 312, 339, 360, 361, 375, 403, 423, 458, 468, 469 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Alois P. Heinz, Table of n, a(n) for n = 1..5000

MAPLE

with(numtheory):

b:= proc(n) option remember; `if`(n=1, 1,

      add(b(n/q*`if`(q=2, 1, prevprime(q))), q=factorset(n)))

    end:

a:= proc(n) a(n):= b(n)+ `if`(n=1, 0, a(n-1)) end:

seq(a(n), n=1..100);  # Alois P. Heinz, Aug 09 2012

CROSSREFS

Sequence in context: A087797 A280619 A282136 * A140691 A316468 A099627

Adjacent sequences:  A153727 A153728 A153729 * A153731 A153732 A153733

KEYWORD

easy,nonn

AUTHOR

Naohiro Nomoto, Dec 31 2008

EXTENSIONS

More terms from Alois P. Heinz, Aug 09 2012

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 22 21:09 EDT 2018. Contains 316505 sequences. (Running on oeis4.)