mersenneforum.org some prime-related trick questions
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 2003-09-22, 20:06 #1 ixfd64 Bemusing Prompter     "Danny" Dec 2002 California 2·3·397 Posts some prime-related trick questions Bored? Give these tests to your friends! :D 1. Some natural numbers have two factors. Some have three, some have four, and so on. How many have one factor? 2. Before 26,972,593 - 1 was discovered, what was the largest Mersenne prime whose exponent was less than 10 million? 3. Find the factors of the prime number 213,466,917 -1. 4. (This one's sorta dumb.) You want to do some math work with Prime95, MFAC (for double-Mersenne numbers), and Proth.exe (for Proth and other primes), but you only want one program to be running at once. Which do you load first? Answers: 1. All of them. Every natural number has at least one factor. Notice how I didn't use the word "exactly"? 2. 26,972,593 - 1. It was always there, even before it is discovered. 3. 1 and 213,466,917 - 1. Notice the word "prime". 4. Your computer.
 2003-09-23, 12:42 #2 cheesehead     "Richard B. Woods" Aug 2002 Wisconsin USA 22·3·641 Posts G...r...o...a...n...!
 2003-09-23, 12:53 #3 eepiccolo     Dec 2002 Frederick County, MD 17216 Posts On a more serious note, would this have been better to post in the solved puzzles section, because technically, the solution has already been given?

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