Category "number-theory"

Describing a numbering system that counts from x at the y position in an index

From a theoretical perspective, I'm interested in learning how one would correctly describe a numbering system that starts counting from x at the y position in

Why some Large number (around 100 digit) can factor out very fast?

I am new to number theory, I am trying to prime factor large numbers in around 100 digit numbers. like my program factor out a 93 digit number in 30min while