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 July 18th, 2012, 10:20 AM #1 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038 All-prime time! All digits prime in this multiplication: Code:  775 33 ====== 2325 2325 ======  25575 You're welcome!
 July 18th, 2012, 11:17 AM #2 Senior Member   Joined: Jan 2010 Posts: 205 Thanks: 0 Re: All-prime time! Mathemagics
 July 18th, 2012, 03:52 PM #3 Math Team   Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 408 More primes! [color=beige]. . [/color]$\begin{array}{cccccccc} 7&3&9&3&9&1&3&3 \\ \\ 7&3&9&3&9&1&3 \\ \\ 7&3&9&3&9&1 \\ \\ 7&3&9&3&9 \\ \\ 7&3&9&3 \\ \\ 7&3&9 \\ \\ 7&3 \\ \\ 7 \end{array}\;\;\;\;\text{All primes}$ [color=beige]. . [/color]$\begin{array}{cccccc}&&&&& 7 \\ \\ &&&& 9 & 7 \\ \\ &&& 3&9&7 \\ \\ && 9&3&9&7 \\ \\ & 3&9&3&9&7 \\ \\ 7&3&9&3&9&7 \\ \\ 7&3&9&3&9 \\ \\ 7&3&9&3 \\ \\ 7&3&9 \\ \\ 7&3 \\ \\ 7\end{array}\;\;\;\;\text{All primes}$ [color=beige]. . [/color]$\begin{array}{cccccccc} 3&1 \\ \\ 3&3&1 \\ \\ 3&3&3&1 \\ \\ 3&3&3&3&1 \\ \\ 3&3&3&3&3&1 \\ \\ 3&3&3&3&3&3&1 \\ \\ 3&3&3&3&3&3&3&1 \end{array}\;\;\;\;\text{All primes}$ $\text{But }333,333,331 \:=\:17\,\times\,19,607,843$
 July 18th, 2012, 05:05 PM #4 Math Team   Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,597 Thanks: 1038 Re: All-prime time! Since when are 1 and 9 primes?
 July 18th, 2012, 05:45 PM #5 Senior Member   Joined: Jan 2010 Posts: 205 Thanks: 0 Re: All-prime time! I don't see him listing 1 or 9 as a prime number...?

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