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 2012-12-14, 06:20 #1222 odicin   Sep 2011 Potsdam, Germany 2×3×19 Posts Added 110393 : 505*2^1165307-1 (350796 digits)
 2012-12-21, 09:50 #1223 MyDogBuster     May 2008 Wilmington, DE 22·23·31 Posts k=373 http://primes.utm.edu/primes/page.php?id=110449 373*2^1575751-1 is prime
2012-12-24, 19:28   #1224
gd_barnes

May 2007
Kansas; USA

2·5·17·61 Posts

Quote:
 Originally Posted by MyDogBuster http://primes.utm.edu/primes/page.php?id=110449 373*2^1575751-1 is prime
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.

2012-12-25, 09:44   #1225
MyDogBuster

May 2008
Wilmington, DE

22·23·31 Posts

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

 2013-01-14, 09:50 #1226 kar_bon     Mar 2006 Germany 1011010010012 Posts 341*2^1129218-1 is prime
 2013-01-14, 13:35 #1227 AMDave     Jan 2006 deep in a while-loop 12228 Posts kar_bon reports the first NPLB prime of the year
 2013-02-07, 21:52 #1228 MyDogBuster     May 2008 Wilmington, DE 22×23×31 Posts http://primes.utm.edu/primes/page.php?id=111148 361*2^1033973-1 is prime First of the 17k maxi drive
 2013-02-10, 04:26 #1229 MyDogBuster     May 2008 Wilmington, DE 54448 Posts k361 http://primes.utm.edu/primes/page.php?id=111174 361*2^1043099-1 is prime
 2013-02-17, 22:42 #1230 kar_bon     Mar 2006 Germany 33·107 Posts 375*2^1066662-1 is prime.
 2013-02-17, 22:57 #1231 MyDogBuster     May 2008 Wilmington, DE 22×23×31 Posts Nice one Karsten.
 2013-02-18, 22:54 #1232 MyDogBuster     May 2008 Wilmington, DE 285210 Posts k381 http://primes.utm.edu/primes/page.php?id=111282 381*2^1070022-1 is prime

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