20040813, 19:21  #1 
Jul 2004
Mid Calder, Scotland
5×37 Posts 
How long before you found your first composite number?
Hey Guys,
Hope this is the right thread! How long was it before your first composite number on any test? I have a number of tests running and I haven't found a single composite number yet (I've been on the search for 5 months)! I was wondering if I had hit a "rich vein" of exponents that might yield something nice or if this was an everyday occurence? Any comments?? Cheers, Mark 
20040813, 21:13  #2 
Sep 2002
2×331 Posts 
The first one, I don't know but in the past 11.5 months I've found 17 factors
doing TF (Trial Factoring) 24/7 so on average 1 every 20 (24h) days using two PC's so about 1 every 40 days for one PC. 1 Ghz PCs If you do LL (LucasLehmer first time tests) then very nearly every time you send in a result it is a composite, just don't know the factors, only the extremely rare ones are Mersenne primes. Last fiddled with by dsouza123 on 20040813 at 21:14 
20040814, 11:26  #3  
Banned
"Luigi"
Aug 2002
Team Italia
12EC_{16} Posts 
Quote:
Luigi 

20040814, 12:21  #4  
Oct 2003
Australia, Brisbane
2·5·47 Posts 
Bundu: I am a little confused by what you have said.
Quote:
1) You just finished your first LL test after 5 months or 2) You have been factoring for 5 months but have not yet found a factor. Therefore have been unable to prove that any of the numbers that you have been tested to be composite or prime. or I am completly off on the wrong track? I am assuming that you are working for GIMPS?? Am I right?? 

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