+497 A positive integer is called terrific if it has exactly $12$ positive divisors. A positive integer is called fine if it has exactly 2 positive divisors. Which numbers are fine?
+877
A positive integer is called terrific if it has exactly $12$ positive divisors. A positive integer is called fine if it has exactly 2 positive divisors. Which numbers are fine?
I can't figure out the question about "good" numbers,
in fact, I'm not even certain I understood the question.
But I think I can understand this one.
Positive integers that happen to be Prime Numbers
have exactly two positive divisors.
.
