You cannot find the first 15 prime numbers by dividing by 2 and 3. This method would not identify 25 as being a composite.
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Any integer greater than one can be co-prime.
The first four prime numbers greater than 10 are , 11, 13,17,19 Their mean is (11 + 13 + 17 + 19) / 4 = 15 NB '15' is NOT a prime number.
The given numbers of 15 and 35 are not prime numbers but they add up to 50
5 is but 15 is not a prime number
The prime factors of 15 are: 3, 5