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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A138945 Positive integers not in A132018. 2
1, 9, 12, 15, 17, 20, 22, 24, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 46, 48, 50, 52, 54, 56, 57, 59, 61, 63, 64, 66, 68, 69, 71, 73, 75, 76, 78, 80, 81, 83, 85, 86, 88, 89, 91, 93, 94, 96, 98, 99, 101, 102, 104, 106, 107, 109, 110, 112, 113, 115, 117, 118, 120, 121, 123 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Sequence A132018 was motivated by analogy to A073071.

The latter remains quite dense in N: up to 1000 only about every 5th number is missing, which motivated to introduce its complement in N*, A138945.

While A132018 starts in a similar way, it becomes more and more sparse (since A000041 grows much faster); and consequently the present sequence becomes very dense.

LINKS

Table of n, a(n) for n=1..65.

PROG

(PARI) pp=1; k=0; for(n=1, 999, pp*=numbpart(n); while(k++!<=pp, print1(k", " )))

CROSSREFS

Cf. A132018, A137620, A058694, A073071, A138946, A135667.

Sequence in context: A050435 A176656 A248903 * A119486 A235341 A161345

Adjacent sequences:  A138942 A138943 A138944 * A138946 A138947 A138948

KEYWORD

nonn,easy

AUTHOR

M. F. Hasler, May 04 2008

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 December 8 02:30 EST 2019. Contains 329850 sequences. (Running on oeis4.)