Online Course Discussion Forum

week 2

 
 
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Re: week 2
by David Reynoso - Friday, April 5, 2019, 12:39 PM
 

The definition of a "prime-prime number" was given in one of the example problems: A prime-prime number is a prime number that yields a prime number when its units digit is omitted; for example, 131 is a three-digit prime-prime number because $131$ is prime and $13$ is prime.