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1 September, 23:26

Let n be an integer from 9 to 38. For how many values of n will be n/5 be prime

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  1. 1 September, 23:36
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    Let p = prime number

    n = {9, 10, 11, ... 37, 38}

    n/5 = p

    n = 5p

    first few primes

    2,3,5,7, ...

    times 5

    10,15,25,35, ...

    n can be 4 values to make n/5 = prime number
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