N = 100000 primes = [False, True] * N // 2 for i in range(3, N, 2):
if primes[i]: k = i ** 2 while k < N: primes[k] = False k += i * 2
if prime[i]: primes.append(i) k = i ** 2 while k < N: prime[k] = False k += i * 2
# Enter your clues
for i in useful: if i[0] == '6' and ('3' in i) and len(str(i)) == 5: print(i)
N = 100000 primes = [False, True] * N // 2 for i in range(3, N, 2):