How many four-digit, positive integers are there where each digit is a prime number?
Revision as of 17:15, 12 June 2022 by Potato noob101 (talk | contribs) (Created page with "There are four one-digit numbers that are prime: 2, 3, 5, and 7. For each of the four digits of our positive integer, we can choose any one of these four numbers. There are th...")
There are four one-digit numbers that are prime: 2, 3, 5, and 7. For each of the four digits of our positive integer, we can choose any one of these four numbers. There are thus 
such integers.
