import time from math import sqrt start = time.time() primes_below = 2000000 primes = [2] candidate = 3 while primes_below >= candidate: limit = sqrt(candidate) for p in primes: if p > limit: #print p, limit primes.append(candidate) break if candidate % p == 0: break candidate += 2 #print primes print sum(primes) elapsed = (time.time() - start) print(elapsed)
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