A138945 Positive integers not in A132018.

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

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: A369976 A345498 A248903 * A119486 A235341 A356333

Adjacent sequences: A138942 A138943 A138944 * A138946 A138947 A138948

Keyword

nonn,easy

Author

M. F. Hasler, May 04 2008

Status

approved