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pepi37 2019-02-15 06:58

Serge, I will hang myself to the first tree :)
Two primes, again you are convincingly leading in this class: but as I know you and Propper you will not stop here....

But on the other hand, I cannot beat those computer resources Propper have, so I must reconcile with destiny , and I must know what is my limits :))


paulunderwood 2019-02-15 16:53

[QUOTE=Batalov;508606]But wait...![/QUOTE]

[URL=""]99*10^1536527-1 is prime![/URL]

Congrats Serge and Ryan for this second Near-redigit prime. :banana:

Dr Sardonicus 2019-02-15 17:51

[QUOTE=Batalov;508606]But wait...![/QUOTE]
Oh, goody! This is [i]way[/i] better than the "there's more!" promised in [strike]scammercials[/strike] infomercials.

I did notice something weird on the page showing the first of the two newly-discovered megaprimes:[quote]Running N+1 test using discriminant 3,[/quote]But-but-but--- 3 isn't a discriminant! Stickelberger's criterion for the discriminant, you know. The discriminant for Q(sqrt(3))/Q is 12.

paulunderwood 2019-02-22 16:13

Serge and Ryan do it again:

[URL=""]993*10^1768283 - 1[/URL] :banana:

Dr Sardonicus 2019-02-22 18:39

[QUOTE=paulunderwood;509141]Serge and Ryan do it again:

[URL=""]993*10^1768283 - 1[/URL] :banana:[/QUOTE]
Verification still "InProcess," but I'm sure that's merely a formality, so congratulations in advance!
:beer2: :beer2:

pepi37 2019-02-22 19:17

[QUOTE=paulunderwood;509141]Serge and Ryan do it again:

[URL=""]993*10^1768283 - 1[/URL] :banana:[/QUOTE]
I will always be second on third or 15 on the list :)

last time they go together they stopped at 5.2 M digits :))

But in any way, congratulations!

LaurV 2019-02-23 02:31

Nice job!
Congrats :party:

Batalov 2019-02-26 00:50

Speaking of other primes - Peter Kaiser's latest Quad is out there in outer space!

[B]10,132 digits! [/B]

This quad has a remarkably high difficulty level! Congratulations to Peter!

Puzzle-Peter 2019-02-26 13:33

I am still trying to decide what to go for next. So many ideas but they are all probably too hard...

Batalov 2019-02-26 19:08

Every section of the specialized Top 20s is interesting in its own way. Breaks the monotony!

Try maybe Irregular primes (both kinds)*, ...maybe Generalized Lucas primitive part, maybe something else? They all need different attacks. All are interesting in their own way.
Well, except some categories :-) Some are just - "plan for a certain number of hours, and you will be done with the next sequence member". For example partition numbers. I am pretty sure that these could be in and out. I found an interesting twist for myself there trying to find a large prime partitions(n^2), and I did; there are no easy others. Maybe someone can find a large prime partitions(n^3)? (though I have probably already tried. I don't remember off the top of my head).

*That would be a lot of ECM; with a specific challenge: it is not documented anywhere how far [I]others [/I]already ECMd. These are rather very refractory to attempts, in my experience.

paulunderwood 2019-02-26 19:47

The Fibonacci PRPs [URL=""]U(130021) and U(148091)[/URL] are ripe for a multi-core Primo proof. Alternatively, there are some smaller Mersenne co-factors that need proofs.

Congrats for your latest quadruplet.

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