# (2^{25243} - 1)/252431 / 403889 / 43014073 / 449245236879223161338352589831

At this site we maintain a list of the 5000 Largest Known Primes which is updated hourly. This list is the most important PrimePages database: a collection of research, records and results all about prime numbers. This page summarizes our information about one of these primes.

Description: | (2^{25243} - 1)/252431 / 403889 / 43014073 / 449245236879223161338352589831 |
---|---|

Verification status (*): | PRP |

Official Comment (*): | Mersenne cofactor, ECPP |

Unofficial Comments: | This prime has 1 user comment below. |

Proof-code(s): (*): | c84 : Underwood, Primo |

Decimal Digits: | 7551 (log_{10} is 7550.6056817839) |

Rank (*): | 80496 (digit rank is 1) |

Entrance Rank (*): | 74354 |

Currently on list? (*): | short |

Submitted: | 12/7/2016 08:39:08 CDT |

Last modified: | 12/7/2016 08:50:38 CDT |

Database id: | 122574 |

Status Flags: | Verify, TrialDiv |

Score (*): | 31.5688 (normalized score 0) |

#### Archival tags:

There are certain forms classed as archivable: these prime may (at times) remain on this list even if they do not make the Top 5000 proper. Such primes are tracked with archival tags.

- Elliptic Curve Primality Proof (archivable *)
- Prime on list:
no, rank305

Subcategory: "ECPP"

(archival tag id 218535, tag last modified 2021-09-18 09:37:41)- Mersenne cofactor (archivable *)
- Prime on list:
yes, rank19

Subcategory: "Mersenne cofactor"

(archival tag id 218536, tag last modified 2021-02-24 00:50:28)

#### User comments about this prime (disclaimer):

User comments are allowed to convey mathematical information about this number, how it was proven prime.... See our guidelines and restrictions.

#### Verification data:

The Top 5000 Primes is a list for proven primes only. In order to maintain the integrity of this list, we seek to verify the primality of all submissions. We are currently unable to check all proofs (ECPP, KP, ...), but we will at least trial divide and PRP check every entry before it is included in the list.

field value prime_id 122574 person_id 9 machine Using: Xeon 4c+4c 3.5GHz what prp notes Command: /home/caldwell/client/pfgw/pfgw64 -tc -q"(2^25243-1)/252431/403889/43014073/449245236879223161338352589831" 2>&1 PFGW Version 3.7.7.64BIT.20130722.x86_Dev [GWNUM 27.11] Primality testing (2^25243-1)/252431/403889/43014073/4492452368...8352589831 [N-1/N+1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 3 Running N+1 test using discriminant 7, base 8+sqrt(7) Calling N+1 BLS with factored part 0.12% and helper 0.09% (0.45% proof) (2^25243-1)/252431/403889/43014073/4492452368...8352589831 is Fermat and Lucas PRP! (3.7619s+0.0003s) [Elapsed time: 4.00 seconds] modified 2020-07-07 17:30:16 created 2016-12-07 08:41:01 id 168216

Query times: 0.0004 seconds to select prime, 0.0011 seconds to seek comments.

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