5
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1/(any number more than 0.5) 2/(any number more than 1) 3/(any number more than 1.5) 4/(any number more than 2) 5/(any number more than 2.5) 6/(any number more than 3) . . etc.
Every prime number except 2 must be odd. This is because if it were even it would be divisible by 2 and so wouldn't be a prime number. The next point to note is that all odd numbers are one more or one less than a multiple of 4. Because 2 more than a multiple of 4 is even, and 3 more than a multiple of 4 is the same as 1 less than the multiple of 4 above. Thus every prime number except 2 must be 1 more or 1 less than a multiple of 4.
4 more than 15 is 4 + 15 = 19.
The number 4 is one more than the number 5. Number 5 includes the first 4 digits, but adds 1 to them.
1 appears more than any other number, so it is the mode.