What is an odd number under 50 with at least 5 factors?

1 Answer
Dec 20, 2016

If it's odd, it cannot have any #2#'s as a factor.

Explanation:

#3# being the next prime, would yield #27=3xx3xx3# as max.
But this only has #1,3,9,27# as factors.

If we combine #3#'s and a #5#, we can get up to #45=3xx3xx5#
This has the factors #1,3,5,9,15,45#