2022-01-18, 16:51 | #2036 |
Oct 2021
Germany
101 Posts |
10404679: 118793848017180226139209650887 (30 digits, 96.584 bits)
This looks like any old factor... until you take a look at the effort required for this one. Normal P-1 is at 1,069.7 GHz-days and the min. bounds are B1=597,137 and B2=22,193,557,699 Bless version 30.8 |
2022-01-20, 17:46 | #2038 |
Aug 2020
79*6581e-4;3*2539e-3
503 Posts |
It was suggested that ECM often makes more sense on those smaller Mersenne than P-1, and yes, there are a lot of low-hanging fruits with t35 done only partially. 1500 B1=1M curves on a 10 core take about 1.5 days and you can be fairly certain you won't miss any factor < 35 digits with that.
Code:
First hit: M177949 Factor: 33673305014952064901960880605783657 (35 digits) ECM B1=1000000, B2=167000000, Sigma=3976350787451175 k = 2^2 × 7 × 113 × 29903617016456689669335223 (boom, take that, P-1) Group order: 2^4 × 3 × 251 × 3319 × 26111 × 111767 × 477073 × 741043 × 816203 |
2022-01-21, 20:39 | #2039 |
1976 Toyota Corona years forever!
"Wayne"
Nov 2006
Saskatchewan, Canada
5181_{10} Posts |
3 in a row via P1.
Code:
Magic_8_Ball 20824319 NF-PM1 2022-01-21 14:35 0.0 B1=800000, B2=288897180 19.4015 Magic_8_Ball 20824147 F-PM1 2022-01-21 14:17 0.0 Factor: 495235256819022693269729 / (P-1, B1=800000, B2=288897180) 19.4015 Magic_8_Ball 20823619 F-PM1 2022-01-21 13:58 0.0 Factor: 25548786609611112273299959 / (P-1, B1=800000, B2=288897180) 19.4015 Magic_8_Ball 20820379 F-PM1 2022-01-21 13:40 0.0 Factor: 1046110442462024597648707729 / (P-1, B1=800000, B2=288897180) 19.4015 Magic_8_Ball 20818361 NF-PM1 2022-01-21 13:21 0.0 B1=800000, B2=288897180 19.4015 |
2022-01-22, 20:29 | #2040 |
Sep 2020
Germany
43 Posts |
M8180143 has a 210.388-bit (64-digit) composite (P25+P39) factor: 2153365510583437050044092603818787130235731554764189688651981753 (P-1,B1=1500000,B2=800578350)
Yeah, my first double factor in one P-1 attempt. And it includes the largest factor, I found so far (#172 in the Top P-1 factor list). |
2022-01-30, 20:09 | #2042 |
"Vincent"
Apr 2010
Over the rainbow
2,843 Posts |
M14691419 has a 148.225-bit (45-digit) composite (P23+P23) factor: 416943345784701035645026212406037518765877617 (P-1,B1=2100000,B2=534604980)
both are 74 bits |
2022-01-31, 10:49 | #2043 |
Aug 2020
79*6581e-4;3*2539e-3
503 Posts |
Code:
M21013 Factor: 262993879056590526599462437387619513220841 (42 digits, 137.6 bits) B1=3000000, B2=528000000, Sigma=6108330422011107 Group order = 2^2 x 3^5 x 11 x 263 x 643 x 19157 x 20071 x 63331 x 147881 x 652601 x 61893779 k = 2^2 x 3 x 5 x 59 x 242399 x 7292786486304502390480104379 Last fiddled with by bur on 2022-01-31 at 10:53 |
2022-02-02, 01:58 | #2044 |
"University student"
May 2021
Beijing, China
373_{8} Posts |
Simon Josefsson has found a factor (7th biggest!)
M108366469 has a factor: 21806524243495451887372970600275462563390077239 (153.933 bits) Congratulations! |
2022-02-03, 00:41 | #2045 |
If I May
"Chris Halsall"
Sep 2002
Barbados
10477_{10} Posts |
Maybe this means I should buy some lottery tickets???
You have to love statistics...
Code:
gpu72ng 11757341 F-PM1 2022-02-03 00:05 6.4 Factor: 18209030934069669978769 / (P-1, B1=2000000, B2=496384980) 18.6152 gpu72 11765911 F-PM1 2022-02-02 23:09 4.3 Factor: 813514493428352514799942217 / (P-1, B1=2000000, B2=496384980) 18.6152 gpu72ng 11757293 F-PM1 2022-02-02 23:03 6.3 Factor: 287095610823108514130103097 / (P-1, B1=2000000, B2=496384980) 18.6152 |
2022-02-04, 07:58 | #2046 |
Aug 2020
79*6581e-4;3*2539e-3
503 Posts |
M22621 has a third factor:
Code:
140986430775391680242875594970278954759 (39 digits, 126.7 bits) ECM, B1=3M, B2=321M, Sigma=3634941837045978 k = 3^3 × 71 × 31481 × 317371 × 5654288209 × 28775289833 |
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