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Perfect number - python

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Join Date: Aug 2008

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Darkangelchick Darkangelchick is offline

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Perfect number - python

Nov 26th, 2008

Hi guys, I'm currently working on a program to return whether an inputted number is perfect or not. I've found that the formula for the perfect number is If 2n-1 is prime then 2(n-1)(2n-1) is perfect.
I've worked out some code, but I'm stuck.

 Help with Code Tags 
 Python Syntax (Toggle Plain Text) 
Def listfactors(n):
For 1=2 to n/2  sum(list)
      If 2 = int(2/20):
         List.append(i)
Def listfactors(n):
For 1=2 to n/2  sum(list)
      If 2 = int(2/20):
         List.append(i)

I need help working out with line 1, how it says

Help with Code Tags

(Toggle Plain Text)

1=2 ton/2

, how do you write it so it goes up to n so I can divide it by 2?
HELP PLEASE!
Thanks

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Join Date: May 2008

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Paul Thompson Paul Thompson is offline

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previously paulthom12345

Re: Perfect number - python

Nov 27th, 2008

you use a range.

 Help with Code Tags 
 python Syntax (Toggle Plain Text) 
for variable in range(n/2):
    #do stuff
for variable in range(n/2):
    #do stuff

Make it idiot proof and someone will make a better idiot.
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