Prime squares have three factors. 4, 9, 25
30, 42, 66, 78, 102, 105, 114, 138 all have exactly three distinct prime factors.
We don't generally consider the negative factors of positive numbers, but they are exactly the same digits as the positive factors, just with minus signs.
Of the numbers from 1 to 30, only 30 has all three of those numbers as factors.
There are not common factors of 30 because there cannot be common factors without two or more numbers to compare. Common factors are factors that the numbers being compared have in common. The factors of 30 are 1, 2, 3, 5, 6, 10, 15, and 30. The prime factors of 30 are 2, 3, and 5.
You need 2 numbers to work out any common factors...You are looking for any factors which are common to both numbers.
Numbers with three factors are squares of primes. So: 4, 9, 25
Prime numbers have exactly two factors. 53 and 59 are prime numbers.
The prime numbers between 30 and 50 are 31, 37, 42, 43 and 47.
31 37 47
There are an infinite number of them. 8 has three prime factors, 30 is the first with three distinct prime factors.
30, 42, 66, 78, 102, 105, 114, 138 all have exactly three distinct prime factors.
30, 42, 66, 70 and 78.
The factors of 30 that are not prime numbers are 6, 10 and 30.
We don't generally consider the negative factors of positive numbers, but they are exactly the same digits as the positive factors, just with minus signs.
Of the numbers from 1 to 30, only 30 has all three of those numbers as factors.
There are five of them: 31 37 41 43 47
31, 37, 41, 43, 47Pick three.