buffer_sieve

primes = []
M = 5*int(1e9)+5
buffer_size = int(1e7)
for start in range(0, M, buffer_size):
    buffer_seive = buffer_size*[True]
    for i in primes:
        j = (start//i)*i
        while j < start + buffer_size:
            if j >= start:
                buffer_seive[j-start]=False
            j += i
    for i in range(max(2, start), start + buffer_size):
        if buffer_seive[i-start]:
            primes.append(i)
            j = i*i
            while j < start+buffer_size:
                buffer_seive[j-start]=False
                j+=i