[seqfan] Re: Factor Database

[Alonso Del Arte]

That looks like a very useful website, though very thin on explanations. I
tried it out with 210*z+199, which is admittedly not much of a test of its
abilities.

Al

On Thu, Sep 16, 2010 at 11:25 AM, Hans Havermann <pxp at rogers.com> wrote:

> I hadn't heard about this prior to Warut Roonguthai mentioning it this
> morning on MathFun in reference to the Triangular + Triangular =
> Factorial thread. For example, the factorizations of 4*z!+1 are:
>
> http://factordb.com/index.php?query=4*z%21%2B1&perpage=200
>
> Or, another example, the repunits:
>
> http://factordb.com/index.php?query=%2810%5Ez-1%29%2F9&perpage=200
>
> When I generated the latter earlier, one of the factors for R186 was
> still shown as composite. I submitted the multiplication in the
> "report factors" at the top and upon refreshing the Repunits, the
> composite for R186 was gone! So we're talking real-time sharing here.
>
> A final example. I had spent 11 months last year re-calculating
> Richard Guy's 776-term aliquot sequence for the number 46758. If
> you're willing to wait 20 seconds:
>
>
> http://factordb.com/sequences.php?se=1&eff=4&aq=46758&action=all&fr=0&to=100
>
> And you can show the graph with one click. I'm in heaven! ;)
>
>
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