| 1520653 | Composite, with 2 known prime factors. Cofactor is composite. Trial Factored to 268 TF target 261 |
| Factored | |
| 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 | C1A16AE87F55C6A0 | 0 | 1 | 3 |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Factored | PRP without proof (not generated) | 2017-10-01 | Oliver Kruse | D5D6E3C542A73D11 | 1 | 0 | 1 | 3 | | Factored | PRP without proof (not generated) | 2017-10-29 | kkmrkkblmbrbk | D5D6E3C542A73D11 | 1 | 858102 | 1 | 3 | | Verified | PRP without proof (not generated) | 2017-11-22 | Oliver Kruse | C1A16AE87F55C6A0 | 2 | 1087966 | 5 | 3 | | Verified | PRP without proof (not generated) | 2017-11-22 | storm5510 | C1A16AE87F55C6A0 | 2 | 1223935 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-09-03 | Carlos Pinho | CERT | Proof certified good | | 2025-09-01 | Kriesel | C-PRP | C1A16AE87F55C6A0 Proof Certified Good
Proof Power: 6
| | 2017-11-22 | storm5510 | C-PRP | M1520653/34529075342527/28191885395429746721 : C1A16AE87F55C6A0 | | 2017-11-22 | Oliver Kruse | C-PRP | M1520653/34529075342527/28191885395429746721 : C1A16AE87F55C6A0 | | 2017-11-21 | TJAOI | F | Factor: 28191885395429746721 | | 2017-10-29 | kkmrkkblmbrbk | C-PRP | M1520653/34529075342527 : D5D6E3C542A73D11 | | 2017-10-01 | Oliver Kruse | C-PRP | M1520653/34529075342527 : D5D6E3C542A73D11 | | 2016-03-17 | alpertron | NF-PM1 | B1=500000, B2=15000000, E=12 |
|
