Sum of 3, 19 & 23 is equal to 45.
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They don't exist. 45 = 3*3*5 = 32*5.
3 is one of the prime numbers of 45.
73 is a prime number, but 45 is not a prime number.
They are:30, 42, 45, 70 nad 78.
There are 45 prime numbers from 1 to 200.