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How many whole numbers between 1 and 150 have exactly 3 different factors?
Wiki User
∙ 14y ago
There are five whole numbers between 1 and 150 that have exactly 3 different factors. Whole numbers between 1 and 150 with exactly 3 different factors must be the square numbers whose square roots are prime.
To find the complete list begin counting... skip 1, not prime; 2 is prime and 2 squared is 4; 3 is prime and 3 squared is 9; skip 4 b/c it is not prime; 5 is prime and 5 squared is 25; 6 not prime; 7 prime and 7 squared is 49; 8 not prime; 10 not prime; 11 prime and squared is 121; 12 is not prime; 13 prime, but squared it is greater than 150. The complete list is 4, 9, 25, 49, and 121. 4 has 1, 2, 4 9 has 1, 3, 9 25 has 1, 5, 25 49 has 1, 7, 49 121 has 1, 11, 121
Wiki User
∙ 14y ago
Anonymous
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What do say for numbers which have exactly 3 factors?
Numbers with exactly three factors are squares of prime numbers.
Numbers that have exactly 4 factors?
They are numbers that are the product of two different prime numbers. If the primes are p and q, the four factors are 1, p, q and pq.
What numbers have exactly 3 factors?
All numbers that are the square of primes have exactly 3 factors.
Numbers with 3 factors?
The squares of all prime numbers above 2 have exactly 3 factors.
What number is between 0 and 1 3?
There are infinitely many numbers between any two different numbers. To get the number that is exactly in the middle, add the two numbers, then divide the result by 2.
How do you explain prime numbers in numbers?
A prime number is a positive integer that has exactly two different factors: 1 and itself. This is why 1 is not a prime number: it has the factors 1 and itself, but they are the same - it does not have exactly two different factors.
Do all prime numbers have exactly 2 different factors?
Yes.
What are two different numbers that have exactly 3 factors?
4 and 9
What do say for numbers which have exactly 3 factors?
Numbers with exactly three factors are squares of prime numbers.
Numbers with exactly 3 factors?
Squares of prime numbers have exactly three factors.
How many square numbers are between 1 and 1000 that have five factors?
There are three of them with exactly five factors.
What three numbers between 1 and 100 have eleven factors?
No numbers between 1 and 100 have exactly eleven factors. 60, 72, 84, 90 and 96 each have twelve factors.
Numbers that have exactly 4 factors?
They are numbers that are the product of two different prime numbers. If the primes are p and q, the four factors are 1, p, q and pq.
What numbers have exactly 3 factors?
All numbers that are the square of primes have exactly 3 factors.
Which of the tower numbers have exactly tw factors?
All numbers that have exactly two factors are prime numbers whereas composite numbers have more than two factors.
Numbers between fifty and one-hundred with nine factors?
In that range, only 100 has exactly 9 factors.
Why are the numbers between 1 and 50 prime?
Because the prime numbers between 1and 50 only have exactly 2 unique factors.
