def eratosthenes(n): N=range(n+1) z=[0]*(n/2) for i in range(2, int(n**.5)+1): if N[i]: N[i*i::i] = z[:(n/i)-i+1] return filter(None, N[2:])
def eratosthenes(n): N=range(n+1) z=[0]*(n/2) for i in range(2, int(n**.5)+1): if N[i]: N[i*i::i] = z[:(n/i)-i+1] return filter(None, N[2:])