20090914, 06:42  #56 
Nov 2008
100100010010_{2} Posts 

20091219, 16:14  #57 
May 2004
New York City
2^{3}×23^{2} Posts 
Getting back to RDS's OP:
What are the Odds that a Random Prime is a Number? Let R = any random prime chosen from a Universe U. Then by a simple argument that I leave as a homework problem, the probability that R is prime is ONE. We need to determine the probability that R is a number. Use reductio ad absurdum (most appropriate). Assume R is NOT a number. Then R is a prime nonnumber in U. This contradicts the undefinition of U, which proves R IS a number. QED Last fiddled with by davar55 on 20091219 at 16:17 Reason: to apologize for this nonrigid argument 
20091228, 20:22  #58 
Aug 2003
Snicker, AL
7×137 Posts 
Methinks your logic is wrong davar.
Lets examine the original question a bit more carefully. The question is kind of like saying "cat". Most of us will immediately think of a common house cat. But a biologist might think of a lion, tiger, oscelot, etc. DarJones 
20100114, 07:31  #59 
Nov 2006
Singapore
3×5^{2} Posts 
Any given prime as in the symbol?

20100115, 01:24  #60  
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
9261_{10} Posts 
That's a bingo?
Quote:


20101013, 10:31  #61  
Sep 2010
Scandinavia
3·5·41 Posts 
Quote:


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