17 19 23 29 31
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The given numbers of 15 and 35 are not prime numbers but they add up to 50
only 59 is prime. rest are composite numbers
They are: 17 19 23 29 and 31
The prime factors of 35 are 5 x 7.
105 is not a prime number, as it's factors are: 1, 3, 5, 7, 15, 21, 35, 105.