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POStuck on Project Euler #3 in python
 

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  1. POStuck on Project Euler #3 in python
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    <blockquote> <p>The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number 600851475143 ?</p> </blockquote> <p>Ok, so i am working on project euler problem 3 in python. I am kind of confused. I can't tell if the answers that i am getting with this program are correct or not. If somone could please tell me what im doing wrong it would be great!</p> <pre><code>#import pdb odd_list=[] prime_list=[2] #Begin with zero so that we can pop later without errors. #Define a function that finds all the odd numbers in the range of a number def oddNumbers(x): x+=1 #add one to the number because range does not include it for i in range(x): if i%2!=0: #If it cannot be evenly divided by two it is eliminated odd_list.append(i) #Add it too the list return odd_list def findPrimes(number_to_test, list_of_odd_numbers_in_tested_number): # Pass in the prime number to test for i in list_of_odd_numbers_in_tested_number: if number_to_test % i==0: prime_list.append(i) number_to_test=number_to_test / i #prime_list.append(i) #prime_list.pop(-2) #remove the old number so that we only have the biggest if prime_list==[1]: print "This has no prime factors other than 1" else: print prime_list return prime_list #pdb.set_trace() number_to_test=raw_input("What number would you like to find the greatest prime of?\n:") #Convert the input to an integer number_to_test=int(number_to_test) #Pass the number to the oddnumbers function odds=oddNumbers(number_to_test) #Pass the return of the oddnumbers function to the findPrimes function findPrimes(number_to_test , odds) </code></pre> <p>Thank You!!</p>
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    1. COIts not neccessary that every one has solved `Project Euler # 3`. At least post the problem statement here. And you need to tell us what's the problem with your code, rather than asking anyone.
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    2. CO_"I can't tell if the answers that i am getting with this program are correct or not."_ Testing a factorization program is easy: just multiply the factors and see if the result matches the original number.
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    3. COtry the sieve algorithm for primes, otherwise brute force is going to take a long long time for `600851475143`.
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