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-   -   Leyland Primes (x^y+y^x primes) (https://www.mersenneforum.org/showthread.php?t=19347)

rogue 2021-01-06 13:36

I cannot access [url]http://chesswanks.com/num/a094133.html[/url].

pxp 2021-01-07 08:52

Thank you. I had some wi-fi issues yesterday that interrupted the communication effort with my Mac-mini farm. In particular, one machine would not let me in over the network. In the past I have solved this by directly connecting (USB-C or crossover ethernet) an obstinate mini to my main computer but this time that did not work. As all of my minis are monitored via screen sharing, I ended up having to haul my living room TV to the mini (I did not want to do the reverse because I would have to unplug it and that would cease its current calculations). Bottom line: after I rebooted the mini's wi-fi I forgot to plug the ethernet cable back into my main machine (which hosts chesswanks).

Interval #18 has roughly twice as many terms (all of them larger) than did #17 (which took about six weeks to finish @ 30 cores). I'm currently idling (sieving and working on the largest-Leyland-prime hunt) those minis that are not engaged in doing intervals #23 and #24. That way when I do #18 I will use [I]all[/I] of my minis for the task and (hopefully) keep the compute time down.

pxp 2021-01-23 00:39

I have examined all Leyland numbers in the gap between L(49878,755) <143547> and L(144999,10) <145000> and found 20 new primes.

NorbSchneider 2021-01-23 13:30

Another new PRP:
27953^28198+28198^27953, 125381 digits.

pxp 2021-01-24 17:34

I have examined all Leyland numbers in the gap between L(144999,10) <145000> and L(145999,10) <146000> and found 7 new primes.

I started interval #18 yesterday. It may be another three days before I can devote all of my cores to the task, as a couple of them are still finishing up previous assignments. I have a very provisional completion date of March 10.

NorbSchneider 2021-01-30 11:37

Another new PRP:
28203^28352+28352^28203, 126175 digits.

NorbSchneider 2021-02-05 19:04

Another new PRP:
28340^28503+28503^28340, 126907 digits.

NorbSchneider 2021-02-25 12:29

Another new PRP:
28781^28930+28930^28781, 129002 digits.

pxp 2021-02-25 21:38

[QUOTE=pxp;570016]I started interval #18 yesterday... I have a very provisional completion date of March 10.[/QUOTE]

It looks like I overestimated this by a week or so. In fact, a couple of my processors have already finished their assigned ranges and I have wasted no time getting them started on interval #19.


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