Leyland Primes (x^y+y^x primes) - Page 21

pxp · 2016-09-04, 16:30

L(17458,7153)
L(15852,6061)
L(18407,4474)
L(18738,3955)

NorbSchneider · 2016-09-25, 20:12

I reached x=25,000 and found 2 new PRPs:
452^24729+24729^452, 65659 digits,
695^24772+24772^695, 70402 digits.

NorbSchneider · 2016-10-25, 20:49

I reached x=26,000 and found 1 new PRP:
771^25718+25718^771, 74250 digits.

xilman · 2016-10-26, 17:39

Quote:

Originally Posted by NorbSchneider

I reached x=26,000 and found 1 new PRP:
771^25718+25718^771, 74250 digits.

Well done!

NorbSchneider · 2016-12-05, 17:28

I reached x=27,000 and found 1 new PRP:
730^26513+26513^730, 75916 digits.

NorbSchneider · 2016-12-28, 22:33

I reached x=27,500 and found 2 new PRPs:
713^27118+27118^713, 77371 digits,
565^27318+27318^565, 75181 digits.

pxp · 2016-12-29, 16:36

After a small hiatus, on December 10 I started again to look for Leyland primes. I have now finished with the Leyland numbers in the gap between L(19021,1576) <60821 digits> and L(29007,128) <61124 digits> and have found therein 6 new PRPs:

L(14708,13707) <60847>
L(15088,10831) <60876>
L(14858,12651) <60950>
L(16069,6258) <61005>
L(14788,13355) <61011>
L(16697,4570) <61110>

XYYXF · 2017-01-04, 15:04

Thanks for them. The page is updated: http://www.primefan.ru/xyyxf/primes.html#0

pxp · 2017-01-23, 18:44

I have now finished with the Leyland numbers in the two gaps between L(19909,1456) <62976 digits> and L(19546,1741) <63345 digits> and have found therein 5 new PRPs:

L(17549,3936) <63090>
L(15346,12941) <63103>
L(15103,15078) <63106>
L(16976,5253) <63158>
L(16458,7031) <63315>

pxp · 2017-02-17, 11:55

I have now finished with the Leyland numbers in the two gaps between L(19732,1265) <61211 digits> and L(18879,1850) <61681 digits> and have found therein 6 new PRPs:

L(17567,3094) <61318>
L(14837,13810) <61429>
L(14821,14166) <61526>
L(15369,10226) <61626>
L(18185,2454) <61645>
L(15937,7408) <61672>

pxp · 2017-03-15, 18:43

I have now finished with the Leyland numbers in the two gaps between L(25742,291) <63426 digits> and L(26336,267) <63905 digits> and have found therein 7 new PRPs:

L(17683,3882) <63466>
L(15852,10157) <63516>
L(16996,5483) <63549>
L(19085,2164) <63654>
L(18855,2402) <63741>
L(18468,2857) <63824>
L(15441,13706) <63879>

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2016-09-04, 16:30	#221
pxp Sep 2010 Weston, Ontario 2³·5² Posts	L(17458,7153) L(15852,6061) L(18407,4474) L(18738,3955)

2016-09-25, 20:12	#222
NorbSchneider "Norbert" Jul 2014 Budapest 109 Posts	I reached x=25,000 and found 2 new PRPs: 452^24729+24729^452, 65659 digits, 695^24772+24772^695, 70402 digits.

2016-10-25, 20:49	#223
NorbSchneider "Norbert" Jul 2014 Budapest 109 Posts	I reached x=26,000 and found 1 new PRP: 771^25718+25718^771, 74250 digits.

2016-12-05, 17:28	#225
NorbSchneider "Norbert" Jul 2014 Budapest 109 Posts	I reached x=27,000 and found 1 new PRP: 730^26513+26513^730, 75916 digits.

2016-12-28, 22:33	#226
NorbSchneider "Norbert" Jul 2014 Budapest 109 Posts	I reached x=27,500 and found 2 new PRPs: 713^27118+27118^713, 77371 digits, 565^27318+27318^565, 75181 digits.

2016-12-29, 16:36	#227
pxp Sep 2010 Weston, Ontario 2³×5² Posts	After a small hiatus, on December 10 I started again to look for Leyland primes. I have now finished with the Leyland numbers in the gap between L(19021,1576) <60821 digits> and L(29007,128) <61124 digits> and have found therein 6 new PRPs: L(14708,13707) <60847> L(15088,10831) <60876> L(14858,12651) <60950> L(16069,6258) <61005> L(14788,13355) <61011> L(16697,4570) <61110>

2017-01-04, 15:04	#228
XYYXF Jan 2005 Minsk, Belarus 2⁴×5² Posts	Thanks for them. The page is updated: http://www.primefan.ru/xyyxf/primes.html#0

2017-01-23, 18:44	#229
pxp Sep 2010 Weston, Ontario 2³·5² Posts	I have now finished with the Leyland numbers in the two gaps between L(19909,1456) <62976 digits> and L(19546,1741) <63345 digits> and have found therein 5 new PRPs: L(17549,3936) <63090> L(15346,12941) <63103> L(15103,15078) <63106> L(16976,5253) <63158> L(16458,7031) <63315>

2017-02-17, 11:55	#230
pxp Sep 2010 Weston, Ontario C8₁₆ Posts	I have now finished with the Leyland numbers in the two gaps between L(19732,1265) <61211 digits> and L(18879,1850) <61681 digits> and have found therein 6 new PRPs: L(17567,3094) <61318> L(14837,13810) <61429> L(14821,14166) <61526> L(15369,10226) <61626> L(18185,2454) <61645> L(15937,7408) <61672>

2017-03-15, 18:43	#231
pxp Sep 2010 Weston, Ontario 11001000₂ Posts	I have now finished with the Leyland numbers in the two gaps between L(25742,291) <63426 digits> and L(26336,267) <63905 digits> and have found therein 7 new PRPs: L(17683,3882) <63466> L(15852,10157) <63516> L(16996,5483) <63549> L(19085,2164) <63654> L(18855,2402) <63741> L(18468,2857) <63824> L(15441,13706) <63879>