## Re: number length

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• I get about 6.5*10^999836. This would indicate a length of 999837 digits. - David ... +1? ... suggested ... job. ... find the size
Message 1 of 5 , Jan 6, 2007
I get about 6.5*10^999836. This would indicate a length of 999837
digits.

- David
--- In primenumbers@yahoogroups.com, Phil Carmody <thefatphil@...>
wrote:
>
> --- Jacques Tramu <jacques.tramu@...> wrote:
> > >Can someone calculate the length of N= (2^1660693)*(2^1660693+21)
+1?
> >
> > >I esimated it as [(2*1660693)*((log 2)/(log 10))] as someone
suggested
> > >and arrived at L(N)= 999,999. How inaccurate is it?
> >
> > GMP gives : 998838
>
> Maybe it does, maybe it doesn't, but it's the wrong tool for the
job.
>
> Calculating the value of a simple expression you're only going to
find the size
> of is lazy thinking.
>
> The size of a^b is b times the size of a.
> The size of a*b is the sum of the sizes of a and b.
>
> Phil
>
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