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Old 2020-11-26, 02:16   #3
Dr Sardonicus
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Feb 2017

434010 Posts

Originally Posted by artacer View Post
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 26-million decimal digit number is prime by trial division?
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 26-million 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.

Last fiddled with by Dr Sardonicus on 2020-11-26 at 02:17 Reason: gixnif stopy
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