5+2+1=8 and 8 is not divisible by 3.
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Three consecutive whole numbers can be written as x, x + 1 and x + 2. Added together, their sum can be written as 3x + 3. Not only is that sum divisible by three, but by doing so [3(x + 1)] you can see that the sum is also equal to three times the second number.
No. Any three consecutive numbers will have at least one of them which is divisible by 2, which means it cannot be prime. And since 1 is not considered a prime number, it cannot happen.
Yes but the on prime numbers are 2,3
The numbers are 30, 31 and 32.
The numbers are 9, 11 and 13.