Are there any other sums of n consecutive factorials that sum up to a perfect square?
Either list them all or prove there are none.
If you have to start with 1, then there are no other solutions as daniel showed.
But if you don't have to start with 1:
4! + 5! = 12^2
I haven't checked for others
Posted by Larry
on 2018-06-26 10:13:21