| 1337269 | Composite, with 5 known prime factors. Cofactor is composite. Trial Factored to 268 TF target 260 |
| Factored | |
| P-1 factors | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 280 / 280 | | 30 | 250000 | 105 / 640 |
Estimated T-Level: 25.8 ⓘ TF below 2^81 is very unlikely to find new factors due to ECM effort. |
| PRP | | Status | Proof | Date | User | Residue | Shift | Type | Base |
|---|
| Factored | Certified Good Power=6 | 2025-09-01 | Kriesel | 061FBCC52AE9242C | 0 | 1 | 3 |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of known factors | Shift | Type | Base |
|---|
| Factored | PRP without proof (not generated) | 2017-10-05 | Oliver Kruse | CEAFD7CF870053D1 | 4 | 0 | 1 | 3 | | Factored | PRP without proof (not generated) | 2017-10-24 | kkmrkkblmbrbk | CEAFD7CF870053D1 | 4 | 660536 | 1 | 3 | | Verified | Certified Good | 2021-07-16 | /r/counting | 061FBCC52AE9242C | 5 | 517059 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-09-03 | Wolfy339 | CERT | Proof certified good | | 2025-09-01 | Kriesel | C-PRP | 061FBCC52AE9242C Proof Certified Good Proof Power: 6
| | 2021-07-16 | Massimo Cappelli (ik5pwa) | CERT | Proof certified good | | 2021-07-16 | /r/counting | C-PRP | M1337269/63290267233/881418900523319/3292148951451611681/171242398655593282177/2408778476637792918910169 : 061FBCC52AE9242C Proof Certified Good Proof Power: 6
| | 2021-07-16 | TJAOI | F-ECM | Factor: 2408778476637792918910169 | | 2017-10-24 | kkmrkkblmbrbk | C-PRP | M1337269/63290267233/881418900523319/171242398655593282177/3292148951451611681 : CEAFD7CF870053D1 | | 2017-10-05 | Oliver Kruse | C-PRP | M1337269/63290267233/881418900523319/171242398655593282177/3292148951451611681 : CEAFD7CF870053D1 | | 2017-09-30 | Oliver Kruse | C-PRP | M1337269/63290267233/881418900523319/171242398655593282177/3292148951451611681 : CEAFD7CF870053D1 | | 2016-05-04 | TJAOI | F | Factor: 3292148951451611681 | | 2015-01-15 | alpertron | F-PM1 | Factor: 171242398655593282177 / B1=500000, B2=15000000 | | 2014-05-07 | TJAOI | F | Factor: 881418900523319 |
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