Exercise
Which of the following 4-tuples of numbers can be used for RSA?
(p, q, v, w) = (5,7,5,5).
(p, q, v, w) = (5,12,5,9).
(p, q, v, w) = (5,7,4,6).
Yes!
No, q is not a prime.
No, the product vw is not 1 mod (p - 1)(q - 1).