20170505, 21:59  #12 
May 2009
Russia, Moscow
100111111011_{2} Posts 
BTW, sequence 3366 also needs some hard ECM on C195@i2180. I did full t55 (18000@11e7) but have limited resources to take it further.

20170506, 06:58  #13 
Oct 2006
Berlin, Germany
264_{16} Posts 
Would it be possible to run stage 1 for the 10000 curves with B1=29e8 on GPU?
And can somebody do it? I would run stage 2 afterwards. 
20170506, 12:45  #14 
Jun 2012
2^{5}·3·31 Posts 
AS276
I dropped a note to Ryan yesterday alerting him to the existence of this thread in case he had interest. This morning he sent me this
Code:
Input number is 146958403500264369785547548773534064181201262260218085297440392878383892186824414643378590631107799775986185342359664860673182664805915775593953028576817423653521299222191420905092930824557639076598363 (201 digits) Using MODMULN [mulredc:0, sqrredc:2] Using B1=7600000000, B2=324909696561468, polynomial Dickson(30), sigma=814068971 dF=1048576, k=25, d=11741730, d2=19, i0=629 Expected number of curves to find a factor of n digits: 35 40 45 50 55 60 65 70 75 80 8 21 60 190 660 2483 9979 42978 194971 938688 Step 1 took 39791886ms Using 24 small primes for NTT Estimated memory usage: 4777M Initializing tables of differences for F took 4615ms Computing roots of F took 149378ms Building F from its roots took 81163ms Computing 1/F took 29062ms Initializing table of differences for G took 1134ms Computing roots of G took 112613ms Building G from its roots took 85745ms Computing roots of G took 113386ms Building G from its roots took 88387ms Computing G * H took 14793ms Reducing G * H mod F took 15953ms Computing roots of G took 117551ms Building G from its roots took 86185ms Computing G * H took 15073ms Reducing G * H mod F took 15664ms Computing roots of G took 113218ms Building G from its roots took 86291ms Computing G * H took 15155ms Reducing G * H mod F took 15685ms Computing roots of G took 113035ms Building G from its roots took 89617ms Computing G * H took 15002ms Reducing G * H mod F took 16119ms Computing roots of G took 115256ms Building G from its roots took 88074ms Computing G * H took 14599ms Reducing G * H mod F took 15358ms Computing roots of G took 111318ms Building G from its roots took 87578ms Computing G * H took 14781ms Reducing G * H mod F took 15865ms Computing roots of G took 114522ms Building G from its roots took 87471ms Computing G * H took 14960ms Reducing G * H mod F took 16199ms Computing roots of G took 114005ms Building G from its roots took 87993ms Computing G * H took 15252ms Reducing G * H mod F took 15668ms Computing roots of G took 116615ms Building G from its roots took 90888ms Computing G * H took 16013ms Reducing G * H mod F took 15646ms Computing roots of G took 110877ms Building G from its roots took 87894ms Computing G * H took 14924ms Reducing G * H mod F took 15510ms Computing roots of G took 113445ms Building G from its roots took 88641ms Computing G * H took 15545ms Reducing G * H mod F took 15649ms Computing roots of G took 111441ms Building G from its roots took 87906ms Computing G * H took 15017ms Reducing G * H mod F took 15154ms Computing roots of G took 111244ms Building G from its roots took 88618ms Computing G * H took 15138ms Reducing G * H mod F took 16981ms Computing roots of G took 113272ms Building G from its roots took 86699ms Computing G * H took 14530ms Reducing G * H mod F took 17007ms Computing roots of G took 113789ms Building G from its roots took 88423ms Computing G * H took 15182ms Reducing G * H mod F took 15466ms Computing roots of G took 114517ms Building G from its roots took 91294ms Computing G * H took 16384ms Reducing G * H mod F took 16707ms Computing roots of G took 112979ms Building G from its roots took 87971ms Computing G * H took 16115ms Reducing G * H mod F took 15482ms Computing roots of G took 119187ms Building G from its roots took 91174ms Computing G * H took 15448ms Reducing G * H mod F took 16214ms Computing roots of G took 119303ms Building G from its roots took 89950ms Computing G * H took 15699ms Reducing G * H mod F took 16519ms Computing roots of G took 120544ms Building G from its roots took 91226ms Computing G * H took 16179ms Reducing G * H mod F took 16001ms Computing roots of G took 121619ms Building G from its roots took 91794ms Computing G * H took 15702ms Reducing G * H mod F took 16251ms Computing roots of G took 126970ms Building G from its roots took 93380ms Computing G * H took 15486ms Reducing G * H mod F took 16862ms Computing roots of G took 122080ms Building G from its roots took 91765ms Computing G * H took 17270ms Reducing G * H mod F took 16071ms Computing roots of G took 130862ms Building G from its roots took 96044ms Computing G * H took 17502ms Reducing G * H mod F took 18512ms Computing polyeval(F,G) took 168438ms Computing product of all F(g_i) took 586ms Step 2 took 6337368ms ********** Factor found in step 2: 3135163172555178875064536378046330234984169364877281361211958842231 Found probable prime factor of 67 digits: 3135163172555178875064536378046330234984169364877281361211958842231 Probable prime cofactor 46874243990462637310356201495732887005986266709475578981920765898213102249350955733998141848135127026706804456577752515184428860000573 has 134 digits Last fiddled with by swellman on 20170506 at 12:52 
20170506, 15:47  #15 
"Curtis"
Feb 2005
Riverside, CA
3·1,579 Posts 
I considered running some curves, and I certainly wouldn't think anything but "hellyea!" if I'd found that factor. Yay Ryan!
Only a C191 next, within 15e NFS@home range. Extra Yay! 
20170508, 09:35  #16 
Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 89<O<88
3×29×83 Posts 
That's extraordinary. Paul Zimmerman drops a sequence he's been working on for more than a decade, due to no ECM hits on a very large composite, meanwhile you email Ryan and within 24 hours he has a hit at 7 digits above the previously tested level?
That's some baseballtype weirdnessluckyness right there. I'm astonished. I wonder what PZimmerman thinks. (Has anyone alerted him?) By the way I guess we're working on this sequence for now. yoyo, could you (or ChristianB) update the rkn reservations accordingly please? Last fiddled with by Dubslow on 20170508 at 09:36 
20170508, 10:09  #17 
Romulan Interpreter
Jun 2011
Thailand
249A_{16} Posts 
Yeah, my thinking too, haha, mother life is a bitch, isn't her?

20170508, 10:43  #18 
Oct 2006
Berlin, Germany
264_{16} Posts 
Sequence is not reserved here https://www.rechenkraft.net/aliquot/AllSeq.html.
If someone wants to work on it she/he can reserve it in the reservation thread. Does somebody work on it? 
20170508, 17:27  #19 
"Curtis"
Feb 2005
Riverside, CA
4737_{10} Posts 
The sequence should be reserved by/to the forum, and this thread will track results. I'm a fan of using NFS@home when we can, but Ryan may wish to push a few terms on his own I think that's his right, since he found the factor!

20170508, 21:56  #20 
Jun 2012
Boulder, CO
2^{2}·3·23 Posts 
I don't really have the time to work on this sequence at the moment, so I'm happy to let the forum crack away at it for now.

20170510, 12:29  #21 
Jun 2012
2976_{10} Posts 
Well folks, what's next? Anybody want to start ECM on the C191 at say the t50 level?
I can help once it goes to the t55 level in a few days. Or is yoyo better suited for most/all of the ECM for this series? 
20170511, 09:03  #22 
Basketry That Evening!
"Bunslow the Bold"
Jun 2011
40<A<43 89<O<88
3×29×83 Posts 
I'm nearly done with my fartoomonstrous reservation of sequences, after which I'll likely contribute here. But it's only a Sandy Bridge, more than an order of magnitude slower than recent CPUs.

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