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Thread: Small n factoring

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  1. #1
    Senior Member
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    Well I'm doing 200000 to 210000 for all kwith B1=600000 and B2 will probably go to 100*B1 (just getting B1 there on all of them first).

    Found 5 so far, most notably:-

    111430207063079 | 2^202471+1

    That's only 111T for a very low n! Was this previously missed?

    p-1 = 2 * 17 * 19 * 360953 * 477881
    Quad 2.5GHz G5 PowerMac. Mmmmm.
    My Current Sieve Progress: http://www.greenbank.org/cgi-bin/proth.cgi

  2. #2
    Sieve it, baby!
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    We don't have k=1...

  3. #3
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    Sorry, cut and paste error.

    111430207063079 | 24737*2^202471+1

    A sorted and cleaned results_duplicates_excluded_marked.txt has:-

    111371229538703 21181 11665988 3259 0
    111381585663619 19249 3462386 3259 0
    111388239468763 10223 10494725 3259 0
    111457721737709 21181 16796180 3259 0
    111460132600447 10223 8997581 3259 0
    111461408850647 24737 15021727 3259 0
    111469919309137 10223 5272421 3259 0

    I'm checking the gap between 111388239468763 and 111457721737709 now.

    I know how easy it is to forget to submit factors. I failed to submit a couple before I started using Sobistrator. It's quite easy to miss off the first digit when cutting and pasting into the factor submission box.

    When I went back to collect all the information to send to factrange@yahoo.com I checked each and every factor had been submitted and that's where I noticed the two I'd missed.

    Speaking of which I have about 8T worth of ranges to send to factrange@yahoo.com now the emails aren't bouncing :-).
    Last edited by Greenbank; 02-08-2006 at 09:07 AM.
    Quad 2.5GHz G5 PowerMac. Mmmmm.
    My Current Sieve Progress: http://www.greenbank.org/cgi-bin/proth.cgi

  4. #4
    Moderator vjs's Avatar
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    Most n<300k has been missed since the orginal sieve dat was 300K<n<3M followed by 1M<n<20M then finally 991<n<50M.

  5. #5
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    Aha, that explains it.
    Quad 2.5GHz G5 PowerMac. Mmmmm.
    My Current Sieve Progress: http://www.greenbank.org/cgi-bin/proth.cgi

  6. #6
    I love 67607
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    I'm planning to throw some ECM cycles for my range at k=67607, 9m<n<10m to see if I can get faster results when compared to P-1 alone. If I stick to P-1 only, it looks like it'll take at least two more years before I reach 999 (compared to initial projection of 18 months).

    I've scanned through a couple of pages and got confused on how to run the program. It'd be very hepful if anyone could provide some help. Thanks in advance.

  7. #7
    it was my understanding that with such high N values it is muhc more efficient to P-1. I could be wrong however. I don't know taht much about ECM.

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