just one. 3^6=729.
The number of divisors can be computed by looking at the prime factorization
and is given by the product
Since 7 is prime, the only product is
a1 = 6
So only number if the form p^6 have 7 divisors.
And only 3^6 is a 3 digit number.
Posted by Jer
on 2015-03-13 08:50:08