The given numbers are 30, 6, 2, 9, 93, and 5. If we divide 30 by 6, we get 5. Similarly, if we divide 9 by 3, we get 3. If we divide 93 by 3, we get 31. If we divide 5 by 1, we get 5. Therefore, the pattern seems to be dividing each number by the next number in the sequence. Following this pattern, if we divide 6 by 2, we get 3. If we divide 3 by 3, we get 1. If we divide 1 by 1, we get 1. Since 1 is the next number in the sequence, the missing number is 5.