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 Batalov 2023-03-17 05:39

[QUOTE=paulunderwood;624565]Congrats to Roman Trunov and Brian D. Niegocki for the (GFN based) Cunningham Chain [URL="https://primes.utm.edu/primes/page.php?id=135153"]893962950^16384+1 [/URL] and [URL="https://primes.utm.edu/primes/page.php?id=135154"]2*893962950^16384+1[/URL], at 146,659 digits smashing the previous record of 77,078 digits.[/QUOTE]
It was a nice idea, but not sure what (re-)sieve they used. Sure, they had a well-sieved (and dense) b^16384+1 set from past times, but 2*b^16384+1 (and/or b^16384/2+1, too) had to be sieved, which does not look too fast.

Easier to improve that with a traditional sieve, I would think...
[URL="https://t5k.org/primes/page.php?id=135800"]213778324725*2^561417+1[/URL] (p)
[URL="https://t5k.org/primes/page.php?id=135801"]213778324725*2^561418+1[/URL] (2p-1)

 paulunderwood 2023-03-17 07:37

[QUOTE=Batalov;626928]It was a nice idea, but not sure what (re-)sieve they used. Sure, they had a well-sieved (and dense) b^16384+1 set from past times, but 2*b^16384+1 (and/or b^16384/2+1, too) had to be sieved, which does not look too fast.

Easier to improve that with a traditional sieve, I would think...
[URL="https://t5k.org/primes/page.php?id=135800"]213778324725*2^561417+1[/URL] (p)
[URL="https://t5k.org/primes/page.php?id=135801"]213778324725*2^561418+1[/URL] (2p-1)[/QUOTE]

Congrats for the 169,015 digits pair.

 Cybertronic 2023-03-17 13:35

Congrats, page was updated !
[url]https://www.pzktupel.de/JensKruseAndersen/cc.php[/url]

 pepi37 2023-04-08 16:38

New 1.58M near-repdigit is found :)
From last hit in same sequence difference is only cca 8500 candidates :) ( and 2.5 years time difference) :)

And now it is official :)

[URL="https://t5k.org/primes/page.php?id=135919"]https://t5k.org/primes/page.php?id=135919[/URL]

92 ·10^1585996-1

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