On Fri, 5 Sep 2008, Terry Carroll wrote:
> On Sat, 6 Sep 2008, John Fouhy wrote:
>
> > You can count the number of fives in the prime decomposition of a
> > number by just dividing by 5 repeatedly until you don't get a whole
> > number.
>
> But that requires having the number first, doesn't it?
On Sat, 6 Sep 2008, John Fouhy wrote:
> 2008/9/5 Terry Carroll <[EMAIL PROTECTED]>:
> > So here's my routine to address the problem. It consists of making a
> > multiplication table of coefficients that includes the factor such as 5,
> > 25, 125, etc., and their values (1, 6, 31, etc). Then, sta
2008/9/5 Terry Carroll <[EMAIL PROTECTED]>:
> So here's my routine to address the problem. It consists of making a
> multiplication table of coefficients that includes the factor such as 5,
> 25, 125, etc., and their values (1, 6, 31, etc). Then, starting with the
> highest ones first, successiev
Wow. What a group. Terry, don't feel bad about the
answer. I already derived it using all the information I got yesterday.
Your solution is a very nice addition to what I learned, and I
appreciate that very much.
Again, thanks to everyone who provided hints, equations, proofs, and
logic paths
On Thu, 4 Sep 2008, Robert Berman wrote:
> Time to do some reading about regex. And here I thought I was slick
> working with lists and strings.
You shouldn't need a regexp for this. An easy way to count the trailing
zeros is:
- convert the number to a string;
- make a copy, stripping off the
On Thu, 4 Sep 2008, Robert Berman wrote:
> "It can easily be seen that 6! = 720 and has exactly one
> trailing zero. What is the lowest integer, x, such that x! has 7^20
> trailing zeros?"
>
> It does not, on the surface, appear to be a frontal lobe breaker. Design
> an algorithm to build factori
Chris,
Thank you very much for this. It is very helpful. I will check my
answer against yours in the morning.
Robert
Chris Fuller wrote:
I spent the day mulling over this problem, and then implemented my solution
when I got home. This is for the easier problem of 7**8 zeros: On my linux
I spent the day mulling over this problem, and then implemented my solution
when I got home. This is for the easier problem of 7**8 zeros: On my linux
box, running something around 2 GHz, my script runs for about two minutes and
the answer is 23059225. You can verify your code to that. I ch
Thank you very much for the help and the math
explanation from Omer. Much of my math background is based on brute
force methodology. Obviously, things have changed. Really changed.
Time to do some reading about regex. And here I thought I was slick
working with lists and strings.
Robert
I
am using both the THINK PYTHON text and the Challenge-You website to
learn Python. I am doing reasonably well and certainly enjoy the
available challenges.
I am currently attempting to work a challenge known as the 'Zeros of a
Factorial' challenge located at http://www.challenge-you.com/ch
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