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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

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Last modified July 12 15:09 EDT 2020. Contains 335665 sequences. (Running on oeis4.)