Thread: Big factors
View Single Post
Old 2013-04-03, 02:20   #5
Batalov
 
Batalov's Avatar
 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2

216508 Posts
Default

Composite factors are not eligible:
153616228560877782360733142221974579132477827835600631264993134521609
= 7160401272398244691 * 219902328863708115073 * 97559577016295905770143558963
The smallest of them should have been found by TF, easily: 62 bits. (Wagstaff numbers have factors of form 2kp+1, just like Mersenne's.)

Let's find some even larger factors...
Code:
P-1 found a factor in stage #1, B1=100000.
2^8232929+1 has a factor: 8203927240046868961280630569987984778892578839825012457683394506843242760078451651993971
[292 bits]
Batalov is offline   Reply With Quote