Probable prime with more than 400k digits
 

How much is important to find a probable prime with more than 400k digits?

[QUOTE=enzocreti;508195]How much is important to find a probable prime with more than 400k digits?[/QUOTE]You can find 151 of them (as of this posting) [url=http://www.primenumbers.net/prptop/prptop.php]right here[/url]. The top two have over 4 [i]million[/i] digits.

prp
 

...yes if my hutch is right, I should find another pg(43k) with exponent greater than 1 million...number of candidates drastically fall down because 43k have to be of the form 41s+r where r=1,10,16,18,37...I hope to find another prp of this form but passed exponent 1 million my computer is too slow with Pfgw...2/3 tests per day!!! and the number of candidates in a range of 100k is about 36. So 36/2=18 days!!!