static const unsigned char small_prime_gaps[] = {
2, 2, 4, 2, 4, 2, 4, 6,
2, 6, 4, 2, 4, 6, 6, 2,
6, 4, 2, 6, 4, 6, 8, 4,
2, 4, 2, 4, 14, 4, 6, 2,
10, 2, 6, 6, 4, 6, 6, 2,
10, 2, 4, 2, 12, 12, 4, 2,
4, 6, 2, 10, 6, 6, 6, 2,
6, 4, 2, 10, 14, 4, 2, 4,
14, 6, 10, 2, 4, 6, 8, 6,
6, 4, 6, 8, 4, 8, 10, 2,
10, 2, 6, 4, 6, 8, 4, 2,
4, 12, 8, 4, 8, 4, 6, 12,
2, 18, 6, 10, 6, 6, 2, 6,
10, 6, 6, 2, 6, 6, 4, 2,
12, 10, 2, 4, 6, 6, 2, 12,
4, 6, 8, 10, 8, 10, 8, 6,
6, 4, 8, 6, 4, 8, 4, 14,
10, 12, 2, 10, 2, 4, 2, 10,
14, 4, 2, 4, 14, 4, 2, 4,
20, 4, 8, 10, 8, 4, 6, 6,
14, 4, 6, 6, 8, 6,
0
};