15, they are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47
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There are 731 pairs.
25. any number in half equals how many twin primes. so 50/2 =25 EX.1-2 =1 1-10 = 5
As numbers get larger, there are more chances that a number will be a multiple of something other than 1.
25 of them.
There are 19 primes.