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 2022-01-18, 16:51 #2036 Luminescence   Oct 2021 Germany 43 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, 14:26 #2037 Xyzzy     Aug 2002 23×1,051 Posts 10713539 M10713539 has a factor: 9646618965808297396650789217449140593554849484807561 (P-1, B1=3000000, B2=21676825170) 7259945416488565152965177 × 1328745384765454647667709393
 2022-01-20, 17:46 #2038 bur     Aug 2020 79*6581e-4;3*2539e-3 23·61 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 Don't take this too serious, I did a lot of P-1 and even P+1 and I definitely get the lottery appeal of it with the chance to score big... :)
 2022-01-21, 20:39 #2039 petrw1 1976 Toyota Corona years forever!     "Wayne" Nov 2006 Saskatchewan, Canada 4,993 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 Flaukrotist   Sep 2020 Germany 22·11 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).

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