20071009, 05:47  #1 
"Jason Goatcher"
Mar 2005
5·701 Posts 
Odd primes
Puzzle: Prove that all primes, including 2, are odd.
You have to think outside the box for this one. It is possible to prove, although mathematical purists(snobs?) won't like the proof. 
20071009, 06:20  #2 
Dec 2005
3×5×13 Posts 
is this the same as to proof that all numbers are odd ?

20071009, 06:21  #3 
Jun 2003
1169_{10} Posts 

20071009, 06:53  #4  
"Jason Goatcher"
Mar 2005
5·701 Posts 
Quote:
All, primes, except 2, are odd. Out of an infinite number of primes, only 2 is even. This makes 2 a very odd prime. Therefore, all primes are odd. 

20071009, 07:04  #5 
Undefined
"The unspeakable one"
Jun 2006
My evil lair
2·5·7·83 Posts 
So it's a play on words.
Odd = not even, and Odd = not normal All primes are odd but not necessarily odd in the same way. 
20071129, 00:00  #6 
Nov 2007
3 Posts 
putting it another way
All primes are odd but some primes are more odd than others

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