There are eleven (11): 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31.
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35
The given numbers of 15 and 35 are not prime numbers but they add up to 50
Because many of them are divisible by smaller odd numbers. For example 35 is divisible by 5 and so 35 cannot be a prime number.
The prime factors of 35 are 5 x 7.
All of them except for 29 and 31 which are prime numbers