136588*5^229171 is prime!

43156*5^441351 is prime!

294698*5^471101 is prime!

Another one bites the dust
Prime 9164*5^408921 Is there some other way to check these are primes. As the test has some chance of being wrong.(Am i right?) 8494 and 38348 completed upto 50k without any luck. Btw, Is there some statistics/guesses as to how many will fall till say 50k? I got 2/4. jaat 
[QUOTE=jaat]Another one bites the dust
Prime 9164*5^408921 Is there some other way to check these are primes. As the test has some chance of being wrong.(Am i right?)[/QUOTE] Yes, you can use WinPFGW to do a primality test with the tp switch (or tm for a +1 number). No, unless there is a bug in the software or if there were a hardware problem, the number is prime. 
[QUOTE=jaat]Btw, Is there some statistics/guesses as to how many will fall till say 50k?
I got 2/4.[/QUOTE] From the Sierpinski data so far I would guess that a little more than 1 in 3 candidates will be eliminated by finding a prime with an exponent between 20,000 and 50,000. The 4 candidates you worked on were of average combined weight, so I would say you did just a little better than average to eliminate 2. (I moved the last two messages from the reservations thread) 
Thanks to both Rogue and geoff for answering the queries. I checked both the numbers with the WinPFGW and they are prime. It is also nice to know that one can knock a very large fraction of them very quickly. I'll get back to them soon.
jaat 
I wondered if any of the primes we find could be one of a pair of twin primes of the form k*5^n+/1.
Since in any three consecutive integers one must be divisible by 3, for both k*5^n+1 and k*5^n1 to be prime, k must be divisible by 3. It turns out that this is possible for just one of the k we are currently testing, the Riesel candidate k=151026. Of the primes already found, the two largest twin primes of this form were 110538*5^139+/1 and 136674*5^172+/1. 
Hey all. I was wondering: Is this project still "alive"? There is not a lot going on in the forum and only geoff has found primes in the last month, so I started to wonder how many people (or GHz) are working on this problem?
I think I'll get back here when I'm finished with my 2721... 
I have a part time 2.66GHz P4 that I split between this project and PSP, it usually does 810 hours per week.
It is quiet at the moment, but that is OK, there is no rush :) 
99356*5^349941 is prime!

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