| Mn | Status | Details | |||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2557781 | Composite, with 2 known prime factors. Cofactor is composite. | ||||||||||||||||||||||||
| Factored |
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| ECM |
Estimated T-Level: 22.1 ⓘ TF below 2^68 is very unlikely to find new factors due to ECM effort. | ||||||||||||||||||||||||
| PRP Cofactor |
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| History |
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Great Internet Mersenne Prime Search
GIMPS
Finding World Record Primes Since 1996
GIMPS
Finding World Record Primes Since 1996