2n + 1 where n is an integer.
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You can use the formula for an arithmetic series for that.
There are not three odd primes with the sum of 14. The sum of three odd primes will be an odd number.
The sum of two odd numbers is always even.
Because the sum of two odd numbers is always even and the sum of that even number plus another odd number is always odd.
The sum of two odd numbers is always even.