The squares of all prime numbers less than 10.
The squares of all prime numbers less than 10.
The squares of all prime numbers less than 10.
The squares of all prime numbers less than 10.
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
25 and 49
14 (I think).
4, 9, 25, and 49
0, 1, 2, 3
4, 9, 25, 49
All prime numbers less than 50 have exactly two factors. e.g. 2,3,5,7,11,13,17,19,23,29,31,37,41,43 & 47.
Four numbers less than thirty, 12, 18, 20, and 28, each have exactly 6 factors.
The smallest number that has exactly three factors is 4.
Prime squares have three factors. There are 11 of them in that range.
The ones with less than three factors.
All the numbers less than 100 that are the product of exactly three different prime numbers are 30, 42, 66, 70, and 78.