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If a number, when divided by 6, is more than 5, then the number must be greater than 30 and so cannot be between 29 and 30.
(n+3)÷n
56
To work it out for yourself, you need to understand that a prime number is a number than can only be divided by 1 and itself. 18 can be divided by 2 39 can be divided by 3 42 can be divided by 2 which leaves 31 which can only be divided by 1 and 31.