Leyland Primes (x^y+y^x primes) - Page 12

NorbSchneider · 2016-03-14, 22:51

I found 2 new PRPs:
7406^12879+12879^7406, 49837 digits,
8335^12882+12882^8335, 50510 digits.

Andrey, the file factortable_xy-yx_1_100.txt in https://groups.yahoo.com/
neo/groups/ggnfs/files group contains all factorization for x < 101 as
in your results.txt. For 100 < x < 151 as in your results2.txt have I
nothing found to the y^x-x^y numbers.

To the y^x-x^y PRPs have I nothing new found in the above group,
you know y^x-x^y PRPs, thats are not on my webpage?

pxp · 2016-03-18, 03:00

New PRP: L(15215,4762). I'm still working on eight gaps but that's down from as many as eighteen, having diverted processes to another project: smallest prime containing a given number of zeros. So I don't see myself doing y^x-x^y, Norbert. If anything, after I've had my fill of this diversion, I'll get back to advancing my indexing full on.

NorbSchneider · 2016-03-19, 20:34

I reached x=12,900 and found 1 new PRP:
12356^12885+12885^12356, 52724 digits.

pxp · 2016-03-23, 19:51

L(13875,3712)

NorbSchneider · 2016-03-26, 09:25

Quote:

Originally Posted by rogue

I started sieving for x=11301 to x=12400. Unfortunately I only have one computer

Thank you Mark, the range is reserved for you. I also use only one computer to the
search.

pxp · 2016-03-26, 12:30

L(15631,3816)

pxp · 2016-03-28, 19:37

L(16375,2626)

pxp · 2016-04-01, 22:38

L(13211,7468)

XYYXF · 2016-04-03, 01:49

Please check the updated page: http://www.primefan.ru/xyyxf/primes.html#0

pxp · 2016-04-03, 13:00

L(13736,11949). My indexing was recently upped to #1031 L(18661,390) but it will be a little while before I progress further: I haven't even started the next three gaps.

XYYXF · 2016-04-03, 20:55

There are small gaps up to (20956,283). That milestone seems to be reachable :-)

2016-04-03, 20:55	#132
XYYXF Jan 2005 Minsk, Belarus 2⁴×5² Posts	There are small gaps up to (20956,283). That milestone seems to be reachable :-) Last fiddled with by XYYXF on 2016-04-03 at 21:48

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2016-03-14, 22:51	#122
NorbSchneider "Norbert" Jul 2014 Budapest 1101101₂ Posts	I found 2 new PRPs: 7406^12879+12879^7406, 49837 digits, 8335^12882+12882^8335, 50510 digits. Andrey, the file factortable_xy-yx_1_100.txt in https://groups.yahoo.com/ neo/groups/ggnfs/files group contains all factorization for x < 101 as in your results.txt. For 100 < x < 151 as in your results2.txt have I nothing found to the y^x-x^y numbers. To the y^x-x^y PRPs have I nothing new found in the above group, you know y^x-x^y PRPs, thats are not on my webpage?

2016-03-18, 03:00	#123
pxp Sep 2010 Weston, Ontario 2³×5² Posts	New PRP: L(15215,4762). I'm still working on eight gaps but that's down from as many as eighteen, having diverted processes to another project: smallest prime containing a given number of zeros. So I don't see myself doing y^x-x^y, Norbert. If anything, after I've had my fill of this diversion, I'll get back to advancing my indexing full on.

2016-03-19, 20:34	#124
NorbSchneider "Norbert" Jul 2014 Budapest 155₈ Posts	I reached x=12,900 and found 1 new PRP: 12356^12885+12885^12356, 52724 digits.

2016-03-23, 19:51	#125
pxp Sep 2010 Weston, Ontario 2³×5² Posts	L(13875,3712)

2016-03-26, 12:30	#127
pxp Sep 2010 Weston, Ontario 2³·5² Posts	L(15631,3816)

2016-03-28, 19:37	#128
pxp Sep 2010 Weston, Ontario 2³×5² Posts	L(16375,2626)

2016-04-01, 22:38	#129
pxp Sep 2010 Weston, Ontario 2³·5² Posts	L(13211,7468)

2016-04-03, 01:49	#130
XYYXF Jan 2005 Minsk, Belarus 2⁴×5² Posts	Please check the updated page: http://www.primefan.ru/xyyxf/primes.html#0

2016-04-03, 13:00	#131
pxp Sep 2010 Weston, Ontario 2³·5² Posts	L(13736,11949). My indexing was recently upped to #1031 L(18661,390) but it will be a little while before I progress further: I haven't even started the next three gaps.