# 7225 · 2^{525688} + 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: | 7225 · 2^{525688} + 1 |
---|---|

Verification status (*): | Proven |

Official Comment (*): | Generalized Fermat |

Proof-code(s): (*): | L1481 : Kowalik, PSieve, Srsieve, PrimeGrid, LLR |

Decimal Digits: | 158252 (log_{10} is 158251.71519846) |

Rank (*): | 35006 (digit rank is 1) |

Entrance Rank (*): | 4748 |

Currently on list? (*): | no |

Submitted: | 7/20/2010 07:54:03 CDT |

Last modified: | 7/20/2010 08:50:22 CDT |

Removed (*): | 7/30/2010 23:47:51 CDT |

Database id: | 93633 |

Status Flags: | none |

Score (*): | 40.9678 (normalized score 0.0314) |

#### 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.

- Generalized Fermat (archivable *)
- Prime on list:
no, rank2139

Subcategory: "Generalized Fermat"

(archival tag id 210728, tag last modified 2021-09-18 19:37:18)

#### 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 93633 person_id 9 machine Ditto P4 P4 what trial_divided notes Command: /home/ditto/client/TrialDiv/TrialDiv -q 7225 2 525688 1 2>&1 [Elapsed time: 9.126 seconds] modified 2020-07-07 17:30:34 created 2010-07-20 08:05:02 id 116646

field value prime_id 93633 person_id 9 machine Ditto P4 P4 what prime notes Command: /home/ditto/client/pfgw -t -q"7225*2^525688+1" 2>&1 PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4] Primality testing 7225*2^525688+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 3 Using SSE2 FFT Adjusting authentication level by 1 for PRIMALITY PROOF Reduced from FFT(65536,20) to FFT(65536,19) Reduced from FFT(65536,19) to FFT(65536,18) Reduced from FFT(65536,18) to FFT(65536,17) 1051410 bit request FFT size=(65536,17) Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 7225*2^525688+1 is prime! (1424.5900s+0.0000s) [Elapsed time: 23.87 minutes] modified 2020-07-07 17:30:34 created 2010-07-20 08:08:01 id 116647

Query times: 0.0004 seconds to select prime, 0.0006 seconds to seek comments.

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