Forum: Five or Bust - The Dual Sierpinski Problem
2011-02-14, 13:02
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Replies: 90
Views: 97,730
Five luckily busted !!!
Congrats to all !!! :lock::bounce wave::party:
Lucky, indeed! According to the 2008 paper (Helm et al. in Integers) written when the status was 3 down, 5 to go (compared to Samidoost website dated...
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Forum: Prime Sierpinski Project
2010-07-08, 08:47
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Replies: 19
Views: 3,363
k=168451 queue: a prime ? (with some doubt)
Hello,
I've noticed in the stats page, that the k=168451 queue lies behind, stuck at value 9182196 while all other queues are between 9185 and 9187K. Having checked the Sob.dat k=168451 is expected...
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Forum: Prime Sierpinski Project
2010-07-05, 08:40
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Replies: 65
Views: 10,318
I prefer 79309
Eliminating the heaviest would reduce the number of candidates, allowing to reach higher exponents faster. But projectwise, relatively to the resolution of the conjecture, it would be far better to...
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Forum: Riesel Prime Data Collecting (k*2^n-1)
2010-01-04, 01:38
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Replies: 129
Views: 31,755
Results k=2081,2231,2237, n=50-200K
Just sent you the residues in a separate email but forgot to mention I used LLR 3.7.1c
The results are as expected vs NPLB Drive 12:
For n from 50 to 200K:
- no prime for k=2081
- 1 prime for...
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Forum: Riesel Prime Data Collecting (k*2^n-1)
2010-01-01, 23:32
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Replies: 129
Views: 31,755
Double checking k=2081,2231,2237 n=50-200k
Thank you for the information. I took my information from www.rieselprime.de but oops, I didn't realise that most k's were assigned to NPLB when nobody other had already reserved. So the up-to-date...
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Forum: Riesel Prime Data Collecting (k*2^n-1)
2009-12-31, 15:47
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Replies: 129
Views: 31,755
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Forum: Five or Bust - The Dual Sierpinski Problem
2009-12-06, 22:31
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Replies: 83
Views: 92,392
Double checking
Phil,
Given that the mean nb of primes per doubling is now 0.19, the probability of finding a yet undiscovered PRP by double-checking the last sequence (40291) in the relevant range (1.25M to...
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Forum: Five or Bust - The Dual Sierpinski Problem
2009-12-02, 09:08
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Replies: 22
Views: 79,390
OK I understand your calculation: 191M is the...
OK I understand your calculation: 191M is the exponent n for which the probability of finding no PRP between 1 and n is equal to exp(-1) = 0.368, provided that no PRP has been found between 1 and...
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Forum: Five or Bust - The Dual Sierpinski Problem
2009-11-27, 12:13
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Replies: 22
Views: 79,390
Congrats to Engracio and all the group, we're...
Congrats to Engracio and all the group, we're lucky indeed !!!
Regarding the stats for the last prime: The 63M figure for 50% prob looks correct, but I don't understand why "We shouldn't expect 1...
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Forum: Five or Bust - The Dual Sierpinski Problem
2009-09-04, 22:59
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Replies: 25
Views: 82,007
Phil,
Thank you for having provided the...
Phil,
Thank you for having provided the relevant information: the number of surviving candidates for a given factoring depth (sieving depth ?). Then the probability of an individual candidate...
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Forum: Five or Bust - The Dual Sierpinski Problem
2009-09-03, 12:50
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Replies: 25
Views: 82,007
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