- How is 9 and 15 the only numbers that are composite in 20?

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What was Number one on August 16th 1977? How many prime number are there between 1 and 100? What is the smallest 3 digit number which divides 609 and 957 exactly? What is a whole number expressed as a product of factors that are all prime numbers? What are the prime numbers greater than 39 but less than 48?

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