[seqfan] Re: A026480
Charles Greathouse
charles.greathouse at case.edu
Fri Sep 23 19:31:04 CEST 2016
It appears to be A026478, but defined to start with 1, 2, 4. I'll edit the
sequence accordingly.
Charles Greathouse
Case Western Reserve University
On Thu, Sep 22, 2016 at 2:03 AM, <israel at math.ubc.ca> wrote:
> A026480: "a(n) = least positive integer > a(n-1) and not a(i)*a(j)*a(k)
> for 1<=i<=j<=k<=n." has Data 1, 2, 4, 5, 6, 7, 9, 11, 13, 15, 17, 19, 21,
> 23, 27, 29, 31, 33, 37, 39, 41, 43, 47, 51, 53, 57, 59, 61, 67, 69.
>
> This doesn't make any sense to me. Since a(1) = 1, any a(n) =
> a(i)*a(j)*a(k) for the case i=j=1, k=n. Or if you don't allow this, the
> sequence would be the same as A026478: "a(n) = least positive integer >
> a(n-1) and not of form a(i)*a(j)*a(k) for 1<=i<=j<=k<n."
>
> What is this sequence supposed to be?
>
> Cheers,
> Robert
>
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