Several numbers are greater than 12, less than 40, and with exactly 3 factors. They are 18, 20, 27, 28, and 30. The table below is the numbers 13 to 39, factored into prime factors, with rows that match the three factor rule highlighted.
13: 13
14: 2 7
15: 3 5
16: 2 2 2 2
17: 17
18: 2 3 3
19: 19
20: 2 2 5
21: 3 7
22: 2 11
23: 23
24: 2 2 2 3
25: 5 5
26: 2 13
27: 3 3 3
28: 2 2 7
29: 29
30: 2 3 5
31: 31
32: 2 2 2 2 2
33: 3 11
34: 2 17
35: 5 7
36: 2 2 3 3
37: 37
38: 2 19
39: 3 13
25
The answer is 25 because it has the factors 1,5,25! :)
The number is 54. It is greater than 36 and less than 70. One of its factors is 9 and it is an even number.
Products will be greater unless your number set includes a number less than 1.
24
49 has exactly 3 factors (1, 7, and 49) and is greater than 40 and less than 60.
25
The answer is 25 because it has the factors 1,5,25! :)
25
the number is 350 the factors is 175 and 2
the answer is 25 because you're asking for a number greater than 12 and smaller than 40 and has exactly 3 factors so in that case 25 is the only one.
The smallest number that has exactly three factors is 4.
The number is 54. It is greater than 36 and less than 70. One of its factors is 9 and it is an even number.
Products will be greater unless your number set includes a number less than 1.
24
By definition, a prime number has exactly two factors. So, there are no prime numbers with exactly three factors.
The square of any prime number has exactly three factors: 22, 32, 52, etc.