| 1999061 | Composite, with 4 known prime factors. Cofactor is composite. Trial Factored to 268 TF target 262 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 280 / 280 | | 30 | 250000 | 102 / 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 | 2025-09-02 | Kriesel | 506D451CFB04911F | 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 | 4F430E8BEBF08B99 | 1 | 0 | 1 | 3 | | Factored | PRP without proof (not generated) | 2017-11-22 | kkmrkkblmbrbk | 4F430E8BEBF08B99 | 3 | 1643468 | 1 | 3 | | Factored | PRP without proof (not generated) | 2017-11-22 | storm5510 | 4F430E8BEBF08B99 | 3 | 1972143 | 1 | 3 | | Verified | Certified Good | 2022-09-10 | Wojciech Florek | 506D451CFB04911F | 4 | 831851 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-09-03 | Kriesel | CERT | Proof certified good | | 2025-09-02 | Kriesel | C-PRP | 506D451CFB04911F Proof Certified Good
Proof Power: 6
| | 2022-09-10 | skippyd | CERT | Proof certified good | | 2022-09-10 | Wojciech Florek | C-PRP | Proof Certified Good
Proof Power: 7
| | 2022-09-05 | TJAOI | F-ECM | Factor: 444838539913940918011927 | | 2022-08-16 | USAFSS | NF-PM1 | B1=132000, B2=134381520 | | 2017-11-22 | storm5510 | C-PRP | M1999061/4283487957751/66332442289801/4548310071617314687 : 4F430E8BEBF08B99 | | 2017-11-22 | kkmrkkblmbrbk | C-PRP | M1999061/4283487957751/4548310071617314687/66332442289801 : 4F430E8BEBF08B99 | | 2017-10-05 | Oliver Kruse | C-PRP | M1999061/4283487957751/66332442289801/4548310071617314687 : 4F430E8BEBF08B99 | | 2016-06-17 | TJAOI | F | Factor: 4548310071617314687 | | 2008-09-30 | markr | F | Factor: 66332442289801 |
|
