Common and uncommon numbers

[Jonathan Post]

8795 = 5 * 1759
9935 = 5 * 1957

so both of the rare numbers are semiprimes of the form 5*p.

1759 is a common sequence element, seen 206 times; so is 1957,
occurring 182 times.

I am not sure if there is a sequence that has them both, and it might
be artificial to construct one.

But thanks, Zak Sedov and Tony Noe, for the glimpse of (per the 125th
anniversary issue of Nature some years ago): "the frontiers of
ignorance."

On 1/2/08, zak seidov <zakseidov at yahoo.com> wrote:
> --- "T. D. Noe" <noe at sspectra.com> wrote:
>
> >The two least
> > common numbers are 8795
> > and 9935, which do not occur in any sequence in OEIS
>
> me:
>
> 8795=A001358(2335)
> 9935=A001358(2601)
>
> see your b001358.
>
> Happy New Year.
> zak
>
> --- "T. D. Noe" <noe at sspectra.com> wrote:
>
> > Just for fun, I took a snapshot of OEIS on Dec. 16
> > and counted the number
> > of sequences in which n or -n occurs for 0 <= n <=
> > 10000.
> >
> > You can view the graph at
> > http://www.sspectra.com/math/OEIS_Count.gif
> >
> > Because OEIS has only about the first 100 terms of
> > each sequence, there are
> > some truncation effects in the graph.  Still it is
> > interesting.  The powers
> > of 2, such as 4096, are very common.  The two least
> > common numbers are 8795
> > and 9935, which do not occur in any sequence in OEIS
> > (yet).
> >
> > Happy New Year!
> >
> > Tony
> >
> >
>
>
>
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