Leyland Primes (x^y+y^x primes) - Page 41

rogue · 2021-01-06, 13:36

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

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 all 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:

Originally Posted by pxp

I started interval #18 yesterday... I have a very provisional completion date of March 10.

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.

NorbSchneider · 2021-02-28, 18:26

Another new PRP:
28659^28988+28988^28659, 129208 digits.

pxp · 2021-03-01, 18:16

Quote:

Originally Posted by pxp

That makes L(45405,286) #2070.

I have examined all Leyland numbers in the eight gaps between L(45405,286) <111532>, #2070, and L(48694,317) <121787> and found 143 new primes. That makes L(48694,317) #2221.

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2021-01-06, 13:36	#441
rogue "Mark" Apr 2003 Between here and the 2×3²×347 Posts	I cannot access http://chesswanks.com/num/a094133.html.

2021-01-07, 08:52	#442
pxp Sep 2010 Weston, Ontario 2⁶·3 Posts	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 all of my minis for the task and (hopefully) keep the compute time down.

2021-01-23, 00:39	#443
pxp Sep 2010 Weston, Ontario 192₁₀ Posts	I have examined all Leyland numbers in the gap between L(49878,755) <143547> and L(144999,10) <145000> and found 20 new primes.

2021-01-23, 13:30	#444
NorbSchneider "Norbert" Jul 2014 Budapest 107 Posts	Another new PRP: 27953^28198+28198^27953, 125381 digits.

2021-01-24, 17:34	#445
pxp Sep 2010 Weston, Ontario 2⁶·3 Posts	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.

2021-01-30, 11:37	#446
NorbSchneider "Norbert" Jul 2014 Budapest 153₈ Posts	Another new PRP: 28203^28352+28352^28203, 126175 digits.

2021-02-05, 19:04	#447
NorbSchneider "Norbert" Jul 2014 Budapest 107 Posts	Another new PRP: 28340^28503+28503^28340, 126907 digits.

2021-02-25, 12:29	#448
NorbSchneider "Norbert" Jul 2014 Budapest 107 Posts	Another new PRP: 28781^28930+28930^28781, 129002 digits.

2021-02-28, 18:26	#450
NorbSchneider "Norbert" Jul 2014 Budapest 153₈ Posts	Another new PRP: 28659^28988+28988^28659, 129208 digits.