How many positive integers less than 70 have an even amount of positive divisors?
Sorry CPhill: I misread the question!!.
No prob........I do it all the time....LOL!!!
All squares have an odd number of divisors
The squares from 1 to 70 are
1, 4, 9, 16, 25, 36, 49 ,64 = 8 squares
So
70 - 8 =
62 positive integers less than 70 have an even number of divisors