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Old 2005-07-11, 15:19   #1
rogue
 
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Default Finding primes with a PowerPC

For those of you with access a PowerPC, I want to direct you to Phil Carmody's PIES project (the pies_project group in Yahoo).

Over the weekend, I found this 100070 digit prime: Phi(3,-1642659500503^4096)

On my 2.5 GHz G5, the PRP test took only 4 minutes. According to Phil, a 2.0 GHz P4 does this same test in about 10 minutes which means that the PowerPC is very competitive with x86 for numbers of this form. AFAIK, it is the only prime on Chris Caldwell's list that has been found with a PowerPC CPU.

--Mark
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Old 2005-07-11, 16:48   #2
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Quote:
Originally Posted by rogue
Over the weekend, I found this 100070 digit prime: Phi(3,-1642659500503^4096)

AFAIK, it is the only prime on Chris Caldwell's list that has been found with a PowerPC CPU.

--Mark
The 101466 digit prime Phi(3,-1559468^8192) was also found on a PowerPC CPU (a 200MHz POWER3).

-- Thomas
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Old 2005-07-11, 18:46   #3
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Originally Posted by Thomas11
The 101466 digit prime Phi(3,-1559468^8192) was also found on a PowerPC CPU (a 200MHz POWER3).

-- Thomas
I was unaware of that. Awesome. How long did the PRP test take?
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Old 2005-07-12, 08:00   #4
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Originally Posted by rogue
I was unaware of that. Awesome. How long did the PRP test take?
It took about an hour, if I remember correctly.
There is also the 87419 digit prime Phi(3,-216582^8192), which was found on a 250MHz R10000 CPU (SGI). And a few more...

-- Thomas
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Old 2005-07-12, 12:31   #5
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Originally Posted by Thomas11
It took about an hour, if I remember correctly.
There is also the 87419 digit prime Phi(3,-216582^8192), which was found on a 250MHz R10000 CPU (SGI). And a few more...

-- Thomas
Maybe the Prime Pages should indicate which CPU found each prime. Obviously 98% would be x86 or some variant, but it would be nice to see which are not x86.
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