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Old 2008-08-06, 21:13   #56
em99010pepe
 
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I advise all to share the primes found so that we all can take them out from our current files reducing the testing time. Thanks.

michaf, you can take the 7 I found so far from your range. It will eliminate 147 candidates, 5880 seconds of work taken using a 2.96GHz machine.

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Old 2008-08-06, 22:51   #57
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Quote:
Originally Posted by em99010pepe View Post
I advise all to share the primes found so that we all can take them out from our current files reducing the testing time. Thanks.

michaf, you can take the 7 I found so far from your range. It will eliminate 147 candidates, 5880 seconds of work taken using a 2.96GHz machine.
Had already done so for the first 4...
But thanks for warning anyway
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Old 2008-08-07, 06:40   #58
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6859514 51502
40316644 51786
24925372 51893

14994106 57376

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Old 2008-08-07, 11:15   #59
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I have removed the 11 k's with primes found from the remaining posted files.
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Old 2008-08-07, 22:45   #60
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50-53 complete.

28964426 52608

lresults_50K-53K.txt
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Old 2008-08-08, 05:46   #61
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Please stop finding primes until I'm done now :) It's starting to disencourage ;)
I'm at 75% of my range and still have found not a single prime...

Does anyone know the expected number of primes in the say 60k / 70k region?
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Old 2008-08-08, 06:26   #62
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53-56 complete

lresults_53K-56K.txt
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Old 2008-08-08, 07:29   #63
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Quote:
Originally Posted by michaf View Post
Please stop finding primes until I'm done now :) It's starting to disencourage ;)
I'm at 75% of my range and still have found not a single prime...

Does anyone know the expected number of primes in the say 60k / 70k region?

The next primes will credit you.
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Old 2008-08-08, 07:35   #64
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Quote:
Originally Posted by michaf View Post
Please stop finding primes until I'm done now :) It's starting to disencourage ;)
I'm at 75% of my range and still have found not a single prime...

Does anyone know the expected number of primes in the say 60k / 70k region?

In your n=1K range, there are approximately 2140 canditates for k's that didn't currently have a prime before Carlos's most recent single prime. The chance of a prime on a sieve to P=150G for this base and n-range are 1 in ~1500. Therefore, you should expect, on average, 1.4 primes in your range. At the beginning of the range, you had a 76% chance of finding a prime. So it's not particularly unusual that you wouldn't find a prime.

Here is what is truly remarkable: Carlos's n=53K-56K range contained NO primes for MORE k's! If it were for the same # of k's, he would expect 4.3 primes with a 98.6% chance of finding at least one prime. But it was actually higher for both stats since he had more k's than the calculations that I am using.

Primes are very strange!


Gary
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Old 2008-08-08, 17:20   #65
mdettweiler
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Taking 63K-64K, will start on it when the NPLB rally is over.
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Old 2008-08-08, 20:07   #66
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Quote:
Originally Posted by michaf View Post
Taking 62k-63k
Range done, no primes

taking 64-65k
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