12. 13, if you count 200
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There are 14 numbers between 1 & 100 that are divisible by 7.
prime numbers between 0 -100 which are divisible by 7: 7
One of them.
There are (500-100)/2 = 200 numbers divisible by 2 between 100 and 500 counting 100 but not 500. Of these (500-100)/8 = 50 are divisible by 8. So there are 150 numbers between 100 and 500 divisible by two but not by 8. By relative primeness exactly 50 out of these 150 are divisible by 3 and therefore these 50 are exactly the ones divisible by 6 but not by 8.
Just one, and that's the number 7 itself.