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Forum: XYYXF Project 2020-09-20, 03:54
Replies: 404
Views: 36,352
Posted By pxp
I have examined all Leyland numbers in the ten...

I have examined all Leyland numbers in the ten gaps between L(37614,265) <91148>, #1735, and L(40210,287) <98832> and found 117 new primes. That makes L(40210,287) #1862 and advances the index to...
Forum: XYYXF Project 2020-09-06, 09:21
Replies: 404
Views: 36,352
Posted By pxp
I decided to take my sieving of interval #21 to...

I decided to take my sieving of interval #21 to 1e10 and that still has a couple of days to go. In the meantime I am pfgw-ing recently assigned (and already sieved) interval #28 [L(148999,10) -...
Forum: XYYXF Project 2020-08-26, 14:37
Replies: 16
Views: 1,186
Posted By pxp
I am seeing much earlier ETC dates on restarted...

I am seeing much earlier ETC dates on restarted interruptions. Perhaps a better guess than file size being the cause is multi-core implementation. As all of my sieves are run as a single process on a...
Forum: XYYXF Project 2020-08-26, 13:53
Replies: 16
Views: 1,186
Posted By pxp
After I restarted the interrupted run (using its...

After I restarted the interrupted run (using its output file as my new input) the program began with an ETC of September 1. That's quite a change from the previous mid-January 2021. Now those early...
Forum: XYYXF Project 2020-08-26, 06:03
Replies: 16
Views: 1,186
Posted By pxp
Thank you. As I had just finished interval #13, I...

Thank you. As I had just finished interval #13, I was going to have a run-off between the two versions. So I interrupted my running version, took a duplicated output file and removed the +1s for the...
Forum: XYYXF Project 2020-08-26, 05:06
Replies: 404
Views: 36,352
Posted By pxp
I have examined all Leyland numbers in the two...

I have examined all Leyland numbers in the two gaps between L(37738,243) <90029>, #1715, and L(38030,249) <91128> and found 17 new primes. That makes L(38030,249) #1734 and advances the index to...
Forum: XYYXF Project 2020-08-26, 00:47
Replies: 16
Views: 1,186
Posted By pxp
2020-08-12 22:17:06: Sieve started: 3 < p < 5e9...

2020-08-12 22:17:06: Sieve started: 3 < p < 5e9 with 7448612 terms (29963 <= x <= 453605, 2 <= y <= 30453) (expecting 7082193 factors). I am currently at p=418504277 with 7114884 factors found.
Forum: XYYXF Project 2020-08-25, 17:13
Replies: 16
Views: 1,186
Posted By pxp
You had previously provided me with an OS X...

You had previously provided me with an OS X version of this (xyyxsieve.7z (https://www.mersenneforum.org/showthread.php?t=19347&page=35)). As I am currently entering a phase where I will be sieving...
Forum: XYYXF Project 2020-08-21, 21:05
Replies: 404
Views: 36,352
Posted By pxp
I began to wonder if any of these L(x,10) is...

I began to wonder if any of these L(x,10) is prime. I'm doing a run on a list that I didn't sieve particularly deeply and I can say that for x < 300000 the answer is none. Perhaps this had already...
Forum: XYYXF Project 2020-08-20, 11:50
Replies: 404
Views: 36,352
Posted By pxp
I have examined all Leyland numbers in the two...

I have examined all Leyland numbers in the two gaps between L(35829,302) <88857>, #1693, and L(37738,243) <90029> and found 20 new primes. That makes L(37738,243) #1715.
Forum: XYYXF Project 2020-08-16, 23:26
Replies: 2
Views: 257
Posted By pxp
The inclusion may well be my fault! With the sole...

The inclusion may well be my fault! With the sole intention of generating a discussion, on 6 April 2015 I wrote to the Sequence Fanatics discussion list...
Forum: XYYXF Project 2020-08-14, 09:40
Replies: 404
Views: 36,352
Posted By pxp
I have examined all Leyland numbers in the six...

I have examined all Leyland numbers in the six gaps between L(91382,9) <87201>, #1660, and L(35829,302) <88857> and found 27 new primes. That makes L(35829,302) #1693.
Forum: XYYXF Project 2020-08-07, 11:25
Replies: 404
Views: 36,352
Posted By pxp
I have added indicators for intervals #19-#21 to...

I have added indicators for intervals #19-#21 to my list. I have also decided that the above mentioned "beachhead" is far too ambitious. My intended beachhead is now interval #21. I am still in the...
Forum: XYYXF Project 2020-08-06, 12:31
Replies: 404
Views: 36,352
Posted By pxp
I have examined all Leyland numbers in the eight...

I have examined all Leyland numbers in the eight gaps between L(39070,143) <84209>, #1621, and L(91382,9) <87201> and found 31 new primes. That makes L(91382,9) #1660.

Intervals #11-#13 are not...
Forum: XYYXF Project 2020-07-23, 22:48
Replies: 404
Views: 36,352
Posted By pxp
When I first started using pfgw I played with the...

When I first started using pfgw I played with the Terminal window size until what I saw seemed to me what I thought was supposed to be seen. Terminal was wrapping the output so that all results...
Forum: XYYXF Project 2020-07-17, 19:03
Replies: 404
Views: 36,352
Posted By pxp
Trouble in paradise

In addition to running pfgw tests on the last six of those pages (which still have a day-and-a-half to go), I did pfgw tests on the first three pages on my slightly faster iMac. These have now...
Forum: XYYXF Project 2020-07-16, 22:17
Replies: 404
Views: 36,352
Posted By pxp
I will address the two points quoted. I have...

I will address the two points quoted.

I have year-month-day data for all of my own finds and these may differ from data garnered from FactorDB. I've only looked at a few of my early finds and, for...
Forum: XYYXF Project 2020-07-14, 17:59
Replies: 16
Views: 1,186
Posted By pxp
The largest x^y+y^x occurs for y=x which for a...

The largest x^y+y^x occurs for y=x which for a given x-range occurs for the largest x in that range. Thus, the largest Leyland number up to x=13000 is 2*13000^13000, which has 53482 decimal digits....
Forum: XYYXF Project 2020-07-11, 09:43
Replies: 404
Views: 36,352
Posted By pxp
I have examined all Leyland numbers in the four...

I have examined all Leyland numbers in the four gaps between L(32160,329) <80954>, #1565, and L(40495,114) <83295> and found 37 new primes. That makes L(40495,114) #1606 and advances the index to...
Forum: XYYXF Project 2020-07-10, 15:24
Replies: 404
Views: 36,352
Posted By pxp
Sorting Leyland numbers by digit-length — more...

Sorting Leyland numbers by digit-length — more properly, by absolute magnitude — has been my obsession from the get-go. Mark hacked the existing program to accommodate any Leyland-number input file,...
Forum: XYYXF Project 2020-07-06, 12:45
Replies: 404
Views: 36,352
Posted By pxp
There are now 45 sieved pages available for...

There are now 45 sieved pages available for Leyland prime candidates larger than L(328574,15), running from 386434 to 386478 decimal digits. Just replace the number in the URL with the number of...
Forum: XYYXF Project 2020-07-03, 17:20
Replies: 404
Views: 36,352
Posted By pxp
Processor time: 22549.57 sec. (1.62 sieving)...

Processor time: 22549.57 sec. (1.62 sieving) (0.99 cores)
333 terms written to xyyx.pfgw
Primes tested: 98222288. Factors found: 6870. Remaining terms: 333. Time: 22668.14 seconds.

I took...
Forum: XYYXF Project 2020-07-02, 18:08
Replies: 404
Views: 36,352
Posted By pxp
mm5:~ pxp$ cd /Users/pxp/Desktop/rogue ...

mm5:~ pxp$ cd /Users/pxp/Desktop/rogue
mm5:rogue pxp$ ./xyyxsieve -i386434.txt -p3 -P2e9
xyyxsieve v1.5, a program to find factors numbers of the form x^y+y^x
Sieve started: 3 < p < 2e9 with 7203...
Forum: XYYXF Project 2020-07-01, 23:24
Replies: 404
Views: 36,352
Posted By pxp
Adding the comment made no difference. I...

Adding the comment made no difference.

I noticed that the help file had sieve start "3" as the default, suggesting perhaps that -p2 might be an out of range argument. As a result, I reworked my...
Forum: XYYXF Project 2020-07-01, 12:38
Replies: 404
Views: 36,352
Posted By pxp
Largest Leyland Prime Hunt

I have replaced the previously referenced first three pages of Leyland prime candidates > L(328574,15) with versions that are now ABC format as opposed to my original (x,y) format. They are also...
Showing results 1 to 25 of 164

 
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