15 · 21368428 + 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.
This prime's information:
| Description: | 15 · 21368428 + 1 |
|---|---|
| Verification status (*): | Proven |
| Official Comment (*): | [none] |
| Unofficial Comments: | This prime has 1 user comment below. |
| Proof-code(s): (*): | g279 : Cooper, NewPGen, PRP, Proth.exe |
| Decimal Digits: | 411940 (log10 is 411939.05099773) |
| Rank (*): | 15566 (digit rank is 1) |
| Entrance Rank (*): | 50 |
| Currently on list? (*): | no |
| Submitted: | 2/9/2006 11:12:16 UTC |
| Last modified: | 3/11/2023 15:54:10 UTC |
| Removed (*): | 12/7/2018 11:29:15 UTC |
| Database id: | 77008 |
| Status Flags: | none |
| Score (*): | 43.9099 (normalized score 0.2212) |
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 77008 person_id 9 machine Linux P4 2.8GHz what trial_divided notes Command: /home/caldwell/client/TrialDiv/TrialDiv -q 15 2 1368428 1 2>&1 [Elapsed time: 14.023 seconds] modified 2020-07-07 22:30:42 created 2006-02-09 11:22:01 id 83006
field value prime_id 77008 person_id 9 machine Linux P4 2.8GHz what prime notes Command: /home/caldwell/client/pfgw -t -q"15*2^1368428+1" 2>&1 PFGW Version 20031027.x86_Dev (Beta 'caveat utilitor') [FFT v22.13 w/P4] Primality testing 15*2^1368428+1 [N-1, Brillhart-Lehmer-Selfridge] Running N-1 test using base 7 Using SSE2 FFT Adjusting authentication level by 1 for PRIMALITY PROOF Reduced from FFT(196608,19) to FFT(196608,18) Reduced from FFT(196608,18) to FFT(196608,17) Reduced from FFT(196608,17) to FFT(196608,16) 2736872 bit request FFT size=(196608,16) Calling Brillhart-Lehmer-Selfridge with factored part 100.00% 15*2^1368428+1 is prime! (38006.1395s+0.0108s) [Elapsed time: 38006 seconds] modified 2020-07-07 22:30:42 created 2006-02-09 11:23:00 id 83007
Query times: 0.0003 seconds to select prime, 0.0003 seconds to seek comments.
Printed from the PrimePages <t5k.org> © Reginald McLean.