Online Course Discussion Forum

week 2

 
 
Picture of Amy T
week 2
by Amy T - Friday, 5 April 2019, 10:39 AM
 

what is a prime prime number?

 
Picture of David Reynoso
Re: week 2
by David Reynoso - Friday, 5 April 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.