anonymous
  • anonymous
Write python code to display the prime factors of any user given number
Computer Science
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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e.mccormick
  • e.mccormick
I would start with the highest prime that is close to half of the number and work down. Also, you might want to check if it is prime right off.
anonymous
  • anonymous
These were from a couple of years back, but should still work. def makeprimelist(bound): max_ndx = (bound - 1) / 2 sieve = [True] * (max_ndx + 1) for ndx in range(int(bound ** 0.5) / 2): if sieve[ndx]: num = ndx * 2 + 3 sieve[ndx+num:max_ndx:num] = [False] * ((max_ndx-ndx-num-1)//num + 1) return [2] + [ndx * 2 + 3 for ndx in range(max_ndx) if sieve[ndx]] def factors(x,unique=0): if x ==1:return [1] pl = makeprimelist(x) tmp = x factors=[] while tmp > 1: for p in pl: if tmp%p==0: factors.append(p) tmp=tmp/p if unique: factors.sort() i=0 while i < len(factors)-1: if i < len(factors) and factors[i]==factors[i+1]: factors.remove(factors[i]) factors[i]=factors[i]*factors[i] else: i+=1 return factors
anonymous
  • anonymous
and i make no claims that that is the best way to implement either of the functions just the ones i used when i was learning python and playing on projecteuler.net

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