解答例1
def sieve(limit):
is_prime = [0, 0] + [1] * (limit-1)
sq = int(limit ** .5)
for i in range(2, sq+1):
if is_prime[i]:
for j in range(i*i, limit+1, i):
is_prime[j] = 0
return is_prime
res = sieve(int(1e6))
print(' '.join(map(str, (i for i, p in enumerate(res) if p))))
解答例2
a = 代入する値 s = [2] print(2), for i in range(2,a + 1): for h in s: if i % h == 0: break else: if max(s) == h: s.append(i) print(i),