4,6,8,12,14,18,20,24,30,?,?, 4 = 1st odd prime 3+1 6 = 2nd odd prime 5+1 8 = 3rd odd prime 7+1 12 = 4th odd prime 11+1 14 = 5th odd prime 13+1 18 = 6th odd prime 17+1 20 = 7th odd prime 19+1 24 = 8th odd prime 23+1 30 = 9th odd prime 29+1 32 = 10th odd prime 31+1 38 = 11th odd prime 37+1 42 = 12th odd prime 41+1 Edwin