| 2671 | Composite, with 1 known prime factor. Cofactor is composite. Trial Factored to 268 TF target 244 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 280 / 280 | | 30 | 250000 | 640 / 640 | | 35 | 1000000 | 1566 / 1566 | | 40 | 3000000 | 4588 / 4588 | | 45 | 11000000 | 9201 / 9201 | | 50 | 44000000 | 16550 / 16550 | | 55 | 110000000 | 40830 / 40830 | | 60 | 260000000 | 105362 / 105362 | | 65 | 800000000 | 194238 / 194238 | | 70 | 2400000000 | 121774 / 350860 |
Estimated T-Level: 66.7 ⓘ TF below 2^217 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | | Unknown | 0F6A | 0 | Unknown,(aka U) | | Factored | | George Woltman | 8E7F476206810F6A | 0 | Woltman,Prime95,first web release,(aka W4) | | Factored | | Brian J. Beesley | 8E7F476206810F6A | 0 | Mac,John Sweeney,v1.4,(aka J3) | | Factored | 2015-04-11 | MadPoo 🙂 | 8E7F476206810F6A | 1729 | Windows 64-bit,Prime95,v26,(aka We4) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Verified | No proof (small exponent) | 2019-07-26 | ATH | F6966C45A1D11FBE | 1 | 1422 | 5 | 3 | | Verified | No proof (small exponent) | 2019-07-27 | oodaira | F6966C45A1D11FBE | 1 | 2289 | 5 | 3 | | Verified | No proof (small exponent) | 2020-04-17 | Oliver Kruse | F6966C45A1D11FBE | 1 | 1833 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-04-10 | masser | NF-PP1 | Start=143/17, B1=4300000000, B2=4295700000000 | | 2020-04-17 | Oliver Kruse | C-PRP | M2671/2373524441444440625994123521138220202539745927415448738773239691983051831 : F6966C45A1D11FBE | | 2019-07-27 | oodaira | C-PRP | M2671/2373524441444440625994123521138220202539745927415448738773239691983051831 : F6966C45A1D11FBE | | 2019-07-26 | ATH | C-PRP | M2671/2373524441444440625994123521138220202539745927415448738773239691983051831 : F6966C45A1D11FBE | | 2019-07-26 | Ryan Propper | F-ECM | Factor: 2373524441444440625994123521138220202539745927415448738773239691983051831 | | 2018-10-31 | Joss | NF-PM1 | B1=110000000000 | | 2018-01-24 | snme2pm1 | NF | no factor TF: 63-64 | | 2016-11-21 | snme2pm1 | NF | no factor TF: 62-63 | | 2016-02-23 | LaurV | NF | no factor TF: 57-58 | | 2015-06-30 | snme2pm1 | NF | no factor TF: 61-62 | | 2015-06-22 | trebor | NF-PM1 | B1=100000000000, B2=10000000000000, E=12 | | 2015-04-11 | MadPoo 🙂 | C-LL | 8E7F476206810F6A | | 2013-06-18 | BloodIce | NF-PM1 | B1=120000000000 | | 2012-05-22 | bcp19 | NF | no factor TF: 60-61 | | 2011-12-09 | nextPrime | NF-PM1 | B1=11000000000 | | 2011-04-15 | Joss | NF-PM1 | B1=10000000000 | | 2011-01-10 | monst | NF | no factor TF: 58-60 | | 2003-01-16 | Alex Kruppa | NF | no factor TF: 1-57 | | 2002-12-31 | -anonymous- | NF-PM1 | B1=4290000000 | | 2002-12-25 | Alex Kruppa | NF | no factor TF: 1-57 | | 2002-09-14 | -anonymous- | NF-PM1 | B1=3221225472, B2=4290000000, E=48 | | 2002-08-03 | -anonymous- | NF-PM1 | B1=2147483648, B2=4290000000, E=48 | | 2002-05-25 | -anonymous- | NF-PM1 | B1=1073741824, B2=4290000000 | | 2001-06-03 | -anonymous- | NF-PM1 | B1=3000000000, B2=4290000000 | | 2001-06-03 | -anonymous- | NF-PM1 | B1=43000000, B2=4290000000 | | 2001-02-11 | -anonymous- | NF-PM1 | B1=1000000, B2=100000000 | | 2000-08-10 | -anonymous- | NF | no factor TF: 1-56 | | 2000-02-01 | -anonymous- | NF | no factor TF: 54-55 | | 1999-12-23 | -anonymous- | NF | no factor TF: 53-54 | | 1999-09-22 | -anonymous- | NF | no factor TF: 52-53 |
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