Added [URL="http://primes.utm.edu/primes/page.php?id=110393"]110393[/URL] : 505*2^1165307-1 (350796 digits)

k=373
 

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

373*2^1575751-1 is prime

[QUOTE=MyDogBuster;322223][URL]http://primes.utm.edu/primes/page.php?id=110449[/URL]

373*2^1575751-1 is prime[/QUOTE]

I just realized that both this k and n are palindromes. :smile:

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.

[QUOTE]I just realized that both this k and n are palindromes. :smile:

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. [/QUOTE]Do I get a bonus for that? :question:

341*2^1129218-1 is prime

kar_bon reports the first NPLB prime of the year :smile:

[URL]http://primes.utm.edu/primes/page.php?id=111148[/URL]

361*2^1033973-1 is prime

First of the 17k maxi drive

k361
 

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

361*2^1043099-1 is prime

[url=http://primes.utm.edu/primes/page.php?id=111275]375*2^1066662-1[/url] is prime.

Nice one Karsten.:tu:

k381
 

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

381*2^1070022-1 is prime