# 221 · 780^{258841} - 1

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: | 221 · 780^{258841} - 1 |
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Verification status (*): | Proven |

Official Comment (*): | [none] |

Proof-code(s): (*): | L4001 : Willig, Srsieve, CRUS, LLR |

Decimal Digits: | 748596 (log_{10} is 748595.00344728) |

Rank (*): | 1849 (digit rank is 1) |

Entrance Rank (*): | 719 |

Currently on list? (*): | yes |

Submitted: | 7/22/2018 01:42:53 CDT |

Last modified: | 7/22/2018 08:20:21 CDT |

Database id: | 125495 |

Status Flags: | TrialDiv |

Score (*): | 45.7444 (normalized score 3.8088) |

#### 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 125495 person_id 9 machine Using: Xeon (pool) 4c+4c 3.5GHz what prime notes Command: /home/caldwell/clientpool/1/pfgw64 -tp -q"221*780^258841-1" 2>&1 PFGW Version 3.7.7.64BIT.20130722.x86_Dev [GWNUM 27.11] Primality testing 221*780^258841-1 [N+1, Brillhart-Lehmer-Selfridge] Running N+1 test using discriminant 7, base 1+sqrt(7) Calling Brillhart-Lehmer-Selfridge with factored part 38.52% 221*780^258841-1 is prime! (22961.3151s+0.0190s) [Elapsed time: 6.38 hours] modified 2020-07-07 17:30:14 created 2018-07-22 01:43:01 id 171169

Query times: 0.0004 seconds to select prime, 0.0009 seconds to seek comments.

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