31 ( they are : 4,6,9,10,12,14,15, 16,18,20,21,22,24,25,26,27, 28, 30, 32,33,34,35,36,38,40,42,44,45,46,48,49)
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74
Five.
There are 18.
There are 15 prime numbers and 34 composite numbers because 1 is not considered to be a prime or composite number
49 of them.