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Old 2012-12-14, 06:20   #1222
odicin
 
Sep 2011
Potsdam, Germany

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Added 110393 : 505*2^1165307-1 (350796 digits)
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Old 2012-12-21, 09:50   #1223
MyDogBuster
 
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May 2008
Wilmington, DE

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Default k=373

http://primes.utm.edu/primes/page.php?id=110449

373*2^1575751-1 is prime
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Old 2012-12-24, 19:28   #1224
gd_barnes
 
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May 2007
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Quote:
Originally Posted by MyDogBuster View Post
I just realized that both this k and n are palindromes.

I wonder if this is the first time that it has happened for a base 2 prime where n>1M. I also wonder if it might be a first for n>100K.
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Old 2012-12-25, 09:44   #1225
MyDogBuster
 
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Quote:
I just realized that both this k and n are palindromes.

I wonder if this is the first time that it has happened for a base 2 prime where n>1M. I also wonder if it might be a first for n>100K.
Do I get a bonus for that?

Last fiddled with by MyDogBuster on 2012-12-25 at 09:46
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Old 2013-01-14, 09:50   #1226
kar_bon
 
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341*2^1129218-1 is prime
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Old 2013-01-14, 13:35   #1227
AMDave
 
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kar_bon reports the first NPLB prime of the year
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Old 2013-02-07, 21:52   #1228
MyDogBuster
 
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http://primes.utm.edu/primes/page.php?id=111148

361*2^1033973-1 is prime

First of the 17k maxi drive
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Old 2013-02-10, 04:26   #1229
MyDogBuster
 
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Default k361

http://primes.utm.edu/primes/page.php?id=111174

361*2^1043099-1 is prime
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Old 2013-02-17, 22:42   #1230
kar_bon
 
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375*2^1066662-1 is prime.
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Old 2013-02-17, 22:57   #1231
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Nice one Karsten.
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Old 2013-02-18, 22:54   #1232
MyDogBuster
 
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Default k381

http://primes.utm.edu/primes/page.php?id=111282

381*2^1070022-1 is prime
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