How many of the numbers from the set {1,2,3,...,50} have a perfect square factor other than one?
1, 4, 9, 12, 16, 18, 20, 24, 27, 28, 32, 36, 40, 44, 48=15 have perfect squares as factors.
P.S. 1, 4, 9 have the themselves as "pefect squares as factors".
2^2 ( 1,2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) = 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44,48
3^2(1,2,3, 5) = 9, 18, 27, 45
5^2(1, 2) = 25, 50
7^2 = 49
19 numbers
