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import math def SumPrimesBelow(num): s=0 composites=set([]) for i in range(2,num+1): sieve=[p*i for p in range(2,int(num/i+1))] composites.update(sieve) num = set(range(2,num+1)) primes_below_num = num.difference(composites) for prime in primes_below_num: s+=prime return s print SumPrimesBelow(2000000)
 9 months ago
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