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Earn +20 ptsQ: What are the three numbers below 30 that have exactly 3 factors?
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What do say for numbers which have exactly 3 factors?
Numbers with exactly three factors are squares of prime numbers.
What are the smallest four numbers that have exactly three factors?
4, 9 and 25.
Find all numbers less than 50 that have exactly three factors?
4, 9, 25, 49
A number that has exactly 3 factors?
The way to be sure you have one of these is to take any three distinct prime numbers and multiply them. Those three prime numbers are then the only factors the product can have. An example is the number 30, which has factors of 2, 3 and 5.
Write 3 numbers between 30 and 50 that have exactly 2 factors each?
31, 37, 41, 43, 47Pick three.
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