20040527, 21:23  #1 
Jun 2003
The Computer
3·131 Posts 
Faster than LL?
Please tell me if this is pretty obvious.
I noticed that any composite number over 3 could have two primes added up to equal it. For example: You want to check if 11 is prime. You go down to the next highest prime, 7. 7+2=9, 7+3=10. Any higher would make what it equals higher. You go down to 5 and find you can't add anything to make it up to 11. Therefore, it is prime. Tell me how you like it. It seemed pretty simple so I don't think it will actually beat LL. 
20040527, 21:36  #2 
6809 > 6502
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Aug 2003
101×103 Posts
2·4,999 Posts 
What is the next highest prime to M41?
You have to have knowledge of all primes lower than the number in question, this makes it impractical for titanic numbers, even just hugh numbers. 
20040527, 21:45  #3  
Jul 2003
Thuringia; Germany
2×29 Posts 
Quote:
Cyrix Last fiddled with by cyrix on 20040527 at 21:46 

20040527, 23:39  #4  
May 2004
Vancouver, Canada
2^{2}×5^{2} Posts 
Quote:


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