Python筛法

欧拉筛(线性筛)

def euler_sieve(n):
    pri = []
    not_prime = bytearray(n + 1)
    for i in range(2, n + 1):
        if not not_prime[i]:
            pri.append(i)
        for p in pri:
            if i * p > n:
                break
            not_prime[i * p] = 1
            if i % p == 0:
                break
    return pri