A Mersenne number is one less than a positive power of two. Since the positive power of two is always even, one less than that is always odd.
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The sum of two odd numbers is always even; the sum of three odd numbers is always odd; the sum of four odd numbers is always even; the sum of five odd numbers is always odd; etc
That can't be solved. The sum of five odd numbers will always be an odd number.That can't be solved. The sum of five odd numbers will always be an odd number.That can't be solved. The sum of five odd numbers will always be an odd number.That can't be solved. The sum of five odd numbers will always be an odd number.
No, the sum of three odd numbers will always be odd.
Yes - while multiplying odd numbers by even numbers will always produce an even result.
The sum or product of three odd numbers will always be odd.