3, 5, and 7
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17 is a prime number. 8 and 12 are not prime numbers.
The sum of the first 8 odd numbers is 64.
The prime numbers from 1 to 8 are 2, 3, 5 and 7.
Let + (addition) be a binary operation on the set of odd numbers S. The set S is closed under + if for all a, b ϵ S, we also have a + b ϵ S. Let 3, 5 ϵ the set of odd numbers 3 + 5 = 8 (8 is not an odd number) Since 3 + 5 = 8 is not an element of the set of the odd numbers, the set of the odd numbers is not closed under addition.
No.