mersenneforum.org Primes of the form 2401*2^n+1
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 2023-05-13, 02:39 #1 YaoPlaysMC   Nov 2020 3·5 Posts Primes of the form 2401*2^n+1 I'm planning on searching k=2401 up to 3 million. I have a feeling that this base is slightly lucky due to 2401 = 7*7*7*7.
 2023-05-13, 03:17 #2 YaoPlaysMC   Nov 2020 3·5 Posts I realized that PrimeGrid is already doing all the k's from 1 to 10000 so k=2401 is already taken. Maybe I'll do k = 1234321 instead? Last fiddled with by YaoPlaysMC on 2023-05-13 at 03:23
 2023-05-13, 16:26 #3 Cybertronic     "Norman Luhn" Jan 2007 Germany 2×32×43 Posts For open k's,you can take a look here https://pzktupel.de/Primetables/TableProthTOP10KK.php Line 3446 is listed a k=2401. This top-10000 starts with numbers >308000 digits. Last fiddled with by Cybertronic on 2023-05-13 at 16:28
2023-07-02, 03:22   #4
storm5510
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Quote:
 Originally Posted by Cybertronic For open k's,you can take a look here https://pzktupel.de/Primetables/TableProthTOP10KK.php
Open? All on this list have been tested.

 2023-07-08, 12:34 #5 Andrew Usher   Dec 2022 2×3×7×13 Posts Of course all the specific numbers on the list have been tested and shown prime. An 'open' range is one that has not been tested, and PrimeGrid is indeed testing all k < 10,000 , and recording the primes found, so it would likely be inadvisable to search there.

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