Why these additions?

Which of the following is a prime number?

29 ! + 2017 29! + 2017 21 ! + 2017 21! + 2017 27 ! + 2017 27! +2017 32 ! + 2017 32! + 2017

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1 solution

Steven Perkins
Dec 22, 2017

29! + 2017 = 8841761993739701954543616002017

This is prime, but I needed a computer and a probabilistic prime testing program to determine that. If there is a way to see that without such computational help I'd be interested to see it.

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