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  1. Thread: Server down

    by philmoore
    Replies
    12
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    3,653

    I'll second that! Seems like we are overdue...

    I'll second that! Seems like we are overdue...
  2. Replies
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    2,007

    Just responding to Zuzu's thread: I redid the...

    Just responding to Zuzu's thread: I redid the calculations from our INTEGERS paper and find that we had only a 0.55% chance of solving the dual Sierpinski problem by n=9092392, so we were incredibly...
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    1,875

    Poll: The most likely kind of error would be for a test...

    The most likely kind of error would be for a test to report "composite" but to submit an incorrect residue. Such an error would never be detected until another test reports a different residue. The...
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    17
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    1,875

    Poll: That is good news for the project, that all of...

    That is good news for the project, that all of the "secret" tests have been in agreement. It at least puts some sort of upper bound on the error rate. I'm going to vote "no", I think that the...
  5. Replies
    17
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    1,875

    Poll: I haven't voted because it seems to me that it...

    I haven't voted because it seems to me that it would be more valuable for the project to get some data on error rates first. If 1% of the tests are in error, the chance that we have missed a prime...
  6. Thread: supersecret

    by philmoore
    Replies
    31
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    3,364

    It would be interesting to see your statistics on...

    It would be interesting to see your statistics on error rates, Louie. Wblipp pointed out that this information could be incorporated into a resources allocation model. My guess is that the...
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    5,890

    questions

    Just a few questions in regard to the post of Jimmars:

    quote:

    What scares me is that people that are aganist the war want the U.S. too be a second rate nation that begs the U.N. to defend us.
    ...
  8. Replies
    38
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    5,890

    Yes, Louie can make all the fun he wants over...

    Yes, Louie can make all the fun he wants over people discussing politics, but please leave retarded people out of it!

    A couple of points about Moo's post - Bush said just three days ago that the...
  9. Replies
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    2,348

    homework

    I forgot to give you your homework assignment: Prove that 271,129 is also a Sierpinski number.
  10. Replies
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    2,348

    condensed version

    Here's a condensed version of the proof that 78557 is a Sierpinski number. n = a mod b means that (n-a) is divisible by b, or that dividing n by b leaves a remainder of a.

    If n = 0 mod 2,...
  11. Replies
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    1,445

    You read correctly, this new largest known Proth...

    You read correctly, this new largest known Proth prime, 3*2^2,145,353 + 1, at 648,817 decimal digits was discovered on February 21st and has pushed M34 down to 7th place. The new discovery is a...
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    410

    Maybe not quite yet!

    I see Nuutti just posted this to the primes list:
    http://groups.yahoo.com/group/primenumbers/message/11554
    A new largest known Proth and non-Mersenne prime, 3*2145353+1, at 645817 digits, a factor...
  13. Replies
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    13,827

    Smh is correct, of course, there is no need to...

    Smh is correct, of course, there is no need to sieve the numbers below 1M very deeply. However, since the range 1M-3M was sieved less than optimally (with current software unavailable at that time),...
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    160,783

    Nuutti said: > I think that sieving in the...

    Nuutti said:

    > I think that sieving in the range 3,000,000 -> 20,000,000 should have priority right now, but when we have reached 10T we should consider double check sieving.

    I think it isn't...
  15. Thread: Milestone

    by philmoore
    Replies
    4
    Views
    804

    Thanks!

    Thanks!
  16. Thread: Milestone

    by philmoore
    Replies
    4
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    804

    That's fantastic! I have an EXCEL spreadsheet...

    That's fantastic! I have an EXCEL spreadsheet that charts the progress so far, but I don't know how to attach it to this posting. Can anyone help me figure out how to include it? Thanks.
  17. Thread: k=54459

    by philmoore
    Replies
    5
    Views
    1,329

    Good question! One would expect the higher Proth...

    Good question! One would expect the higher Proth weight k's to go first, but 46157 and 65567 don't fit that expectation. I'm sure that others must have wondered the same thing.

    By the way, you...
  18. Thread: k=54459

    by philmoore
    Replies
    5
    Views
    1,329

    Proth weights

    Yes, indeed, sieving is less efficient on this number. The "Proth weight" (or equivalent "Nash weight") measures how efficient sieving is on a particular k. From another thread, the Proth weights...
  19. Thread: Predictions

    by philmoore
    Replies
    0
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    546

    Predictions

    Predictions are often wrong. Like mine on the thread:
    http://www.free-dc.org/forum/showthread.php?s=&threadid=2268
    Looks like many of us were over-optimistic on that poll! Still, these sorts of...
  20. from Paul Jobling

    Hi Phil,

    I *still* can't post to the SoB forum, but I have been reading it. With
    respect to the observations of k.2^n+1 modulo small primes:

    "Paul Jobling could tell us for sure, but I doubt...
  21. 78557*2^n+1 mod 36

    Play this same game with k=78557:

    n = 0 mod 2: 78557*2^n+1 is divisible by 3.
    n = 1 mod 4: 78557*2^n+1 is divisible by 5.
    n = 7 mod 12: 78557*2^n+1 is divisible by 7.
    n = 11 mod 12: 78557*2^n+1...
  22. Thread: Sieving

    by philmoore
    Replies
    141
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    18,700

    sieving ranges

    That's great news from Louie about the new sieve! My only reservation is that a sieving range of n from 3 million to 5 million seems a little conservative. We ran through all the exponents from 1...
  23. Thread: Sieving

    by philmoore
    Replies
    141
    Views
    18,700

    Sorry, I meant MB when I said GBytes! But the...

    Sorry, I meant MB when I said GBytes! But the input file would be the same for all sievers, since they would all be sieving the same range of n values.
  24. Thread: Sieving

    by philmoore
    Replies
    141
    Views
    18,700

    large data files

    I agree with ceselb, even though the list of numbers not yet eliminated by the sieve would be large, it would not have to be downloaded very often, and it seems that so far, the number of people...
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    1,686

    Poll: Soon. I would guess before the end of January at...

    Soon. I would guess before the end of January at the latest! I also will make a prediction, that SoB finds the third largest known prime some time this year, unless GIMPS discovers another Mersenne...
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