A054507 Log_b 4 where b is smallest primitive root (A001918) mod n-th prime.

2, 4, 2, 2, 12, 2, 4, 2, 18, 2, 12, 12, 36, 2, 2, 2, 2, 12, 16, 8, 2, 32, 68, 2, 88, 2, 6, 24, 18, 2, 20, 2, 2, 140, 126, 2, 80, 2, 2, 2, 88, 68, 2, 14, 2, 138, 2, 42, 144, 132, 140, 220, 96, 118, 2, 38, 18, 128, 36, 2, 186, 44, 236, 2, 242, 272, 2, 2, 328, 270, 218, 2, 2, 268, 2