| 7530421 | Composite, with 2 known prime factors. Cofactor is composite. Trial Factored to 270 TF target 267 |
| Factored | |
| ECM | | Digits | B1 | Curves |
|---|
| 25 | 50000 | 6 / 280 |
Estimated T-Level: 20.1 ⓘ TF below 2^62 is very unlikely to find new factors due to ECM effort. |
| LL | | Status | Date | User | Residue | Shift | Software |
|---|
| Factored | 1999-06-26 | Bernard Henter | 44DE9D0FA437BD72 | 3251651 | Windows,Prime95,v18,(aka WU1) | | Factored | 2002-02-24 | Marc Getty / Phil Fizur | 44DE9D0FA437BD72 | 405652 | Windows,Prime95,v20,NT service,(aka WW5) |
|
| PRP Cofactor | | Status | Proof | Date | User | Residue | Number of
known factors | Shift | Type | Base |
|---|
| Factored | PRP without proof (not generated) | 2020-06-02 | ATH | DFBD2A9EA7349594 | 1 | 1416328 | 5 | 3 | | Factored | PRP without proof (not generated) | 2020-06-03 | marssystems | DFBD2A9EA7349594 | 1 | 1839625 | 5 | 3 | | Verified | Certified Good | 2025-06-24 | Michel Yamagishi | DFBD2A9EA7349594 | 2 | 6857249 | 5 | 3 |
|
| History | | Date | User | Type | Result |
|---|
| 2025-10-17 | Sid & Andy | NF-PM1 | B1=2500000, B2=3943416750 | | 2025-06-24 | Jonathan Webb | CERT | Proof certified good | | 2025-06-24 | Michel Yamagishi | C-PRP | M7530421/429508310827520480921/851037971549140778567 : DFBD2A9EA7349594 Proof Certified Good
Proof Power: 8
| | 2025-06-18 | Greg | F | Factors: 851037971549140778567,429508310827520480921 / TF: 68-70 | | 2020-06-03 | marssystems | C-PRP | M7530421/429508310827520480921 : DFBD2A9EA7349594 | | 2020-06-02 | ATH | C-PRP | M7530421/429508310827520480921 : DFBD2A9EA7349594 | | 2020-06-02 | chuenkit | F | Factor: 429508310827520480921 / TF: 68-69* | | 2018-07-31 | ramgeis | NF | no factor TF: 67-68 | | 2016-09-25 | Gordon Spence | NF | no factor TF: 66-67 | | 2015-06-09 | VictordeHollander | NF | no factor TF: 65-66 | | 2013-12-06 | David Campeau | NF | no factor TF: 64-65 | | 2013-10-18 | Nesowa | NF | no factor TF: 63-64 | | 2012-05-05 | James Heinrich | NF-PM1 | B1=145000, B2=3153750, E=6 | | 2002-02-24 | -anonymous- | C-LL | 44DE9D0FA437BD72 | | 2002-02-10 | -anonymous- | NF-PM1 | B1=40000, B2=560000 | | 1999-06-26 | -anonymous- | C-LL | 44DE9D0FA437BD72 | | 1998-08-02 | MadPoo 🙂 | NF | no factor TF: 1-63 | | 1998-08-02 | -anonymous- | NF | no factor TF: 1-62 |
|
