1729 math_blog
Ok, this is my first factor, and this wouldn't be my last: 8217603681177634115143 divides M773,833,681. I found it while I was trial-factoring M773,833,681 from 2^72 to 2^73. :)
Here is the factor link: https://www.mersenne.ca/exponent/773833681
Now I got my second factor on mersenne.ca. This one is a factor of M9999971879: 17120076576497274889 divides M9999971879 TF 63-64 k=856006236 So this is only a 64-bit factor and I am surprised it wasn
This will be quite a long post. M11=23*89 factored year 1536 M23=47*178481 factored year 1640 M41=13367*164511353 factored year 1859 M59=179951*3203431780337 factored year 1878 M67=193707721*761838257