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Old 2009-10-21, 10:49   #573
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2769*2^498209-1 Another one Woot !!!! woot!!!
http://primes.utm.edu/primes/page.php?id=90553
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Old 2009-10-22, 07:17   #574
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2781*2^498778-1 is prime
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Old 2009-10-22, 08:58   #575
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Quote:
Originally Posted by vaughan View Post
2781*2^498778-1 is prime
With this prime, we've now found 66 primes for n=480K-500K compared with 65 primes for n=460K-480K and 60 primes for n=440K-460K on this drive. There's also one more new one yet to be reported plus an already known one yet to go so there will be at least 68 primes for n=480K-500K.

I think we've got it all wrong. The primes get more numerous as you search higher!
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Old 2009-10-22, 23:58   #576
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Quote:
Originally Posted by gd_barnes View Post

I think we've got it all wrong. The primes get more numerous as you search higher!
I wish :)

2253*2^498443-1
http://primes.utm.edu/primes/page.php?id=90577
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Old 2009-10-24, 08:12   #577
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2373*2^499548-1 is prime
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Old 2009-10-24, 17:39   #578
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2753*2^499386-1 is prime.
http://primes.utm.edu/primes/page.php?id=90603
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Old 2009-10-25, 17:09   #579
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2089*2^499951-1 is confirmed prime
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Old 2009-10-25, 18:49   #580
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Quote:
Originally Posted by gd_barnes View Post
With this prime, we've now found 66 primes for n=480K-500K compared with 65 primes for n=460K-480K and 60 primes for n=440K-460K on this drive. There's also one more new one yet to be reported plus an already known one yet to go so there will be at least 68 primes for n=480K-500K.

I think we've got it all wrong. The primes get more numerous as you search higher!
4 primes have been mentioned since this post so I am guessing we not have at least 70 primes for n=480K-500K.
edit:
There were 41 primes for the range n=425K-440K in this drive. This is 3/4 of the size of the higher ranges. Based on that there should be about 54.67 primes in n=420K-440K which is again lower than higher ranges. I reckon when we test n=420K-425K we will find less than 13.67 primes.

Last fiddled with by henryzz on 2009-10-25 at 19:01
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Old 2009-10-26, 07:44   #581
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Yes, the total was 70 primes for n=480K-500K. Very remarkable. Of course there is no predicatibility for n=420K-425K but it's fun to think that we can based on this inverse pattern of increasing primes. In the mean time, here's the 1st prime for k=2000-3000/n>500K:

2949*2^500481-1 is confirmed prime
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Old 2009-10-26, 09:16   #582
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2967*2^500530-1 is prime
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Old 2009-10-30, 12:15   #583
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2495*2^501636-1 is prime
2657*2^502190-1 is prime
2465*2^502832-1 is prime
2077*2^502977-1 is prime

Last fiddled with by gd_barnes on 2009-11-04 at 03:40 Reason: add primes
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