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-   -   No Comments? (https://www.mersenneforum.org/showthread.php?t=18311)

R.D. Silverman 2013-06-19 17:03

No Comments?
 
Doesn't anyone care to comment on the p77 just found by Sam??

xilman 2013-06-19 17:45

[QUOTE=R.D. Silverman;343828]Doesn't anyone care to comment on the p77 just found by Sam??[/QUOTE]Yes, I'll comment. Until a few seconds ago I wasn't aware that Sam had found a p77, presumably by ECM or you wouldn't have commented yourself.

Batalov 2013-06-19 17:51

Nothing on NUMBRTHRY or on PaulZ's ...or even Sam's own site.
"It's hard to make predictions, especially about the future." ~Y.B.
Anyway, it is smaller than p79. Let's wait for a p80!

bdodson 2013-06-20 01:46

[QUOTE=R.D. Silverman;343828]Doesn't anyone care to comment on the p77 just found by Sam??[/QUOTE]

Neither on the (main) Cunningham tables or on the two "found but not
yet inserted" extension files. Maybe an Euler or Bernoulli? Sam was
saying that purdue has 90K cores suitable for distributed sieving
(small factor bases, maybe?). Not sure how many have enough
memory for the large B1's he's been using, but it's certainly more
that the c. 9K+ cores on the two clusters from the terragrid grant.

-Bruce

Yes, N188, the new 1st place Top10 of 2013.

R.D. Silverman 2013-06-20 17:30

[QUOTE=bdodson;343888]Neither on the (main) Cunningham tables or on the two "found but not
yet inserted" extension files. Maybe an Euler or Bernoulli? Sam was
saying that purdue has 90K cores suitable for distributed sieving
(small factor bases, maybe?). Not sure how many have enough
memory for the large B1's he's been using, but it's certainly more
that the c. 9K+ cores on the two clusters from the terragrid grant.

-Bruce

Yes, N188, the new 1st place Top10 of 2013.[/QUOTE]

90k cores??? Holy <censored!>

I have 14 cores available half-time plus another 8 from older machines.

Batalov 2013-06-20 19:18

[URL="http://factordb.com/index.php?query=14158277750623758793309386870401397333112823632717478051426522029712001260747920789473711562165031101665618225654329210473605281619696918061316240634857984019071572591940586875558943580878119388321001"]N(188)[/URL] c193, that was a good one!

That was a hole left after all the reasonable questions "Why factor N(200) cofactor, when there are smaller holes?" - "Because... you know..."

It is unclear though is NFS would have been faster than an appropriate amount of ECM curves (if not for luck). Because Sam is factoring similarly sized numbers now regularly with gnfs, it was probably pre-testing before running gnfs.

Andi47 2013-06-21 12:12

Congratulations!!

Stargate38 2013-06-21 13:11

That's quite fast!
 
B1 of 1 BILLION?! Wow! I never expected it to be that hard. And 90,000 cores is quite moderate for a supercomputer. Try doing it on the worlds fastest supercomputer and it'll be factored even quicker.

jasonp 2013-06-21 15:33

[QUOTE=Stargate38;344011]B1 of 1 BILLION?! Wow! I never expected it to be that hard. And 90,000 cores is quite moderate for a supercomputer. Try doing it on the worlds fastest supercomputer and it'll be factored even quicker.[/QUOTE]
Try getting ahead of all the other people in line to use the world's fastest supercomputer first :)

(If NFS@Home tried to use all of the supercomputer we've been spending time on, our quota would last maybe half a day)

ixfd64 2013-06-21 17:15

It would be nice if they'd put even a small percentage of those cores towards GIMPS. :smile:

YuL 2013-06-21 18:46

P77 found by ECM
 
Nice!!
By the way I didn't see any comment on the [URL="http://www.factordb.com/index.php?id=1100000000606775582"]P76[/URL] reported about 3 weeks ago by Ryan P. (factor of [URL="http://www.factordb.com/index.php?id=1100000000295975793"]176^176+175^175[/URL] found with B1=26e7) and it doesn't appear in the [URL="http://www.loria.fr/~zimmerma/records/top50.html"]top-50[/URL].
We only need a P74 and a P78 to have all P7x...

lorgix 2013-06-29 20:34

Funny thing, I just ran a few curves on this exact number. Not the thousands of curves that Sam W. probably ran. And the B1 I used was too low.


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