Quote:
Originally Posted by artacer
The suspected Prime is over 26 million digits. I have been trying to factor it since discovery.

I don't understand. Are you trying to prove that a 26million decimal digit number is prime by trial division?
Quote:
Unsuccessful attempts have been made and i did have my Mathematics professor take a look at it and by using some type of modular mathematics found it probable by looking at the first and last digit.

I'm not sure
what you mean is probable, but if you mean one can say it is "probable" that a 26million digit number is prime based on its first and last digit, that is fascinating.
There
is a way to tell a number greater than ten is
composite by its last decimal digit alone  if that digit is 2, 4, 5, 6, 8, or 0, the number is composite.