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 2022-08-09, 16:30 #100 swellman     Jun 2012 24×3×5×17 Posts Cullen 849 I’ve enqueued this as posted (with some slight reordering of the lines), but are you sure about 3 LPs on the rational side while sieving on the algebraic side? It can be changed until it is thrown into sieving status. If it test sieved best using these parameters then so be it but it looked odd to me. But we don’t see many factorizations of pure Cullen numbers anymore, maybe they’re a different beast? Last fiddled with by swellman on 2022-08-09 at 16:31
 2022-08-09, 16:50 #101 kruoli     "Oliver" Sep 2017 Porta Westfalica, DE 2×11×83 Posts Yes! This was my raw data (rational/algebraic/sieve side): Code: 22A: total yield: 2312, q=100001029 (0.21729 sec/rel) 58 Special q, 396 reduction iterations 22R: total yield: 2104, q=100001029 (0.21938 sec/rel) 54 Special q, 384 reduction iterations 23A: total yield: 2882, q=100001029 (0.20435 sec/rel) 58 Special q, 396 reduction iterations 23R: total yield: 2746, q=100001029 (0.23284 sec/rel) 54 Special q, 384 reduction iterations 32A: total yield: 3017, q=100001029 (0.22544 sec/rel) 58 Special q, 396 reduction iterations 32R: total yield: 2614, q=100001029 (0.21088 sec/rel) 54 Special q, 384 reduction iterations 33A: total yield: 3755, q=100001029 (0.99578 sec/rel) 58 Special q, 396 reduction iterations 33R: total yield: 3414, q=100001029 (1.01115 sec/rel) 54 Special q, 384 reduction iterations Edit, normalized: Code: 22A 2164 23A 2697 32A 2824 33A 3515 22R 2115 23R 2761 32R 2628 33R 3432 Last fiddled with by kruoli on 2022-08-09 at 16:58 Reason: Added information.
2022-08-09, 16:59   #102
swellman

Jun 2012

1111111100002 Posts

Quote:
 Originally Posted by kruoli Yes! This was my raw data (rational/algebraic/sieve side): Code: 22A: total yield: 2312, q=100001029 (0.21729 sec/rel) 58 Special q, 396 reduction iterations 22R: total yield: 2104, q=100001029 (0.21938 sec/rel) 54 Special q, 384 reduction iterations 23A: total yield: 2882, q=100001029 (0.20435 sec/rel) 58 Special q, 396 reduction iterations 23R: total yield: 2746, q=100001029 (0.23284 sec/rel) 54 Special q, 384 reduction iterations 32A: total yield: 3017, q=100001029 (0.22544 sec/rel) 58 Special q, 396 reduction iterations 32R: total yield: 2614, q=100001029 (0.21088 sec/rel) 54 Special q, 384 reduction iterations 33A: total yield: 3755, q=100001029 (0.99578 sec/rel) 58 Special q, 396 reduction iterations 33R: total yield: 3414, q=100001029 (1.01115 sec/rel) 54 Special q, 384 reduction iterations
Ok, thank you for the confirmation! It’s already queued and I’ll move it to sieving status later tonight.

2022-08-09, 17:24   #103
charybdis

Apr 2020

114010 Posts

Quote:
 Originally Posted by swellman I’ve enqueued this as posted (with some slight reordering of the lines), but are you sure about 3 LPs on the rational side while sieving on the algebraic side? It can be changed until it is thrown into sieving status.
This does make sense for numbers where the algebraic and rational norms are very similar in size. The special-q essentially gives you a large prime for free on the side that you're sieving on, so this is morally 3 large primes on each side.

 2022-08-11, 15:11 #104 swellman     Jun 2012 24·3·5·17 Posts QUEUED AS 11p8_254 11+8,254 is a SNFS 264 composite from the HCN project ready for sieving on 15e_small. Code: n: 124770258398178107242131430473369370375510834286483169003880299586574202593247463580711485332956285974313251948273561177793178361754355619422761510174288177249352768474487586257335461086084765626108729190558791341 type: snfs size: 264 skew: 0.8993 c6: 121 c0: 64 Y1: -85070591730234615865843651857942052864 Y0: 54763699237492901685126120802225273763666521 rlim: 134000000 alim: 134000000 lpbr: 32 lpba: 32 mfbr: 94 mfba: 64 rlambda: 3.5 alambda: 2.8 Results of test sieving on the rational side with Q in blocks of 1000: Code: MQ Norm_yield Speed (sec/rel) 35 3381 0.151 50 3291 0.163 75 2879 0.194 100 2654 0.211 140 2493 0.241 180 2183 0.273 205 1909 0.310 Suggesting a sieving range for Q of 35-205M to generate 445M raw relations. Aiming for fewer raw relations (old target was ~460M) due to observations by @VBCurtis. I’ll wait for Yoyo to wrap it up before enqueuing the job. Last fiddled with by swellman on 2022-08-13 at 13:28
 2022-08-22, 15:14 #105 RichD     Sep 2008 Kansas 2×2,011 Posts QUEUED AS 51113_250 C251 from the Near-Repdigit project, 51113_250. The SNFS difficulty is 250.71-digit. Code: n: 51111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111113 m: 1000000000000000000000000000000000000000000 c6: 23 c0: 850 skew: 1.83 type: snfs rlim: 134000000 alim: 134000000 lpbr: 31 lpba: 31 mfbr: 62 mfba: 62 rlambda: 2.7 alambda: 2.7 Trial sieving 2K blocks. Code:  Q Yield N-Yld 20M 5472 5293 60M 4298 4486 100M 4100 4047 140M 3390 3651 Last fiddled with by swellman on 2022-08-22 at 15:33
 2022-08-24, 12:04 #106 RichD     Sep 2008 Kansas 2×2,011 Posts QUEUED AS 21111_249 C250 from the Near-Repdigit project, 21111_249. The SNFS difficulty is 250.28-digit. Code: n: 2111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111 m: 100000000000000000000000000000000000000000 c6: 19000 c0: -1 skew: 0.19 type: snfs rlim: 134000000 alim: 134000000 lpbr: 31 lpba: 31 mfbr: 62 mfba: 62 rlambda: 2.7 alambda: 2.7 Trial sieving 2K blocks. Code:  Q Yield N-Yld 20M 6456 6245 60M 4887 5100 100M 4462 4404 124M 4422 4274 Last fiddled with by swellman on 2022-08-24 at 14:20
 2022-08-26, 11:48 #107 swellman     Jun 2012 77608 Posts QUEUED AS 11p3_254 11+3,254 is a SNFS 264 from the HCN project now ready for sieving on 15e_small. Code: n: 67424057153850060120677779598359258132056887148905399271362551582217879519699108422784725600826084662672009166900497025803379070453570749977082733500637054989796931680909432338535168344460673746876997654857923342528013856780638780077430294609703515749 skew: 0.6485 type: snfs size: 264 c6: 121 c0: 9 Y1: -109418989131512359209 Y0: 54763699237492901685126120802225273763666521 rlim: 134000000 alim: 266000000 lpbr: 32 lpba: 32 mfbr: 94 mfba: 64 rlambda: 3.5 alambda: 2.8 Results of test sieving on the rational side with Q in blocks of 1000: Code: MQ Norm_yield Speed (sec/rel) 35 4104 0.226 50 4045 0.235 75 3616 0.265 100 3421 0.307 150 3092 0.339 200 2549 0.388 Suggesting a sieving range for Q of 35-165M in order to generate 455M raw relations. Last fiddled with by swellman on 2022-08-26 at 11:52
 2022-09-01, 07:33 #108 bur     Aug 2020 79*6581e-4;3*2539e-3 733 Posts edit: I looked up this old factorisation, so I'll just use those parameters. I am looking into test sieving for a C174 of aliquot 1992. Can I just use the CADO parameters for GGNFS? CADO has: Code: tasks.I = 14 tasks.qmin = 39200000 tasks.lim0 = 48100000 tasks.lim1 = 67600000 tasks.lpb0 = 30 tasks.lpb1 = 31 tasks.sieve.mfb0 = 60 tasks.sieve.mfb1 = 90 tasks.sieve.ncurves0 = 15 tasks.sieve.ncurves1 = 8 It seems GGNFS needs lambda specified, is it like that and if so, which value would be good? Last fiddled with by bur on 2022-09-01 at 07:59
2022-09-01, 11:30   #109
swellman

Jun 2012

24·3·5·17 Posts

Quote:
 Originally Posted by bur edit: I looked up this old factorisation, so I'll just use those parameters. I am looking into test sieving for a C174 of aliquot 1992. Can I just use the CADO parameters for GGNFS? CADO has: Code: tasks.I = 14 tasks.qmin = 39200000 tasks.lim0 = 48100000 tasks.lim1 = 67600000 tasks.lpb0 = 30 tasks.lpb1 = 31 tasks.sieve.mfb0 = 60 tasks.sieve.mfb1 = 90 tasks.sieve.ncurves0 = 15 tasks.sieve.ncurves1 = 8 It seems GGNFS needs lambda specified, is it like that and if so, which value would be good?
I use lambda values based strictly on lpb, namely (lpb,lambda) pairs are as follows:

Code:
(29,2.5)
(30,2.6)
(31,2.7)
(32,2.8)
(33,3.0)
(34,3.2)
Not terribly insightful but it seems to work. The old GGNFS documentation lacked a lot of detail, though it’s been years since I read it.

2022-09-01, 14:05   #110
charybdis

Apr 2020

100011101002 Posts

Quote:
 Originally Posted by bur It seems GGNFS needs lambda specified, is it like that and if so, which value would be good?
Lambda should be set to log(2^mfb)/log(lim) + 0.2-0.3. It doesn't matter what base you take the log to, it'll give the same result.

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