20040527, 21:23  #1 
Jun 2003
The Computer
3×7×19 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
"""""""""""""""""""
Aug 2003
101×103 Posts
23617_{8} 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:


Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
faster than LL?  paulunderwood  Miscellaneous Math  13  20160802 00:05 
Is it faster to run 1 worker or many?  arbiter21  Information & Answers  17  20160205 05:04 
My CPU is getting faster and faster ;)  lidocorc  Software  2  20081108 09:26 
3PRP faster than LL for GIMPS?  bearnol  Math  35  20051012 14:33 
Faster way to do LLT?  1260  Miscellaneous Math  23  20050904 07:12 