Is there a way to find the first digits of a number?
For example, the largest known prime is $2^{43,112,609}-1$, and I did sometime before a induction to find the first digit of a prime like that. But, is there a way to find the first digits of a number?
To find the last x digits is easy, just calculate it mod $10^x$, but we can do something about the first ones?