>> 2*(10^100000 + 50617) + 1 as a probable prime of 100006 digits;

>

> Am I missing something, according to Mathematica:

>

> 2*(10^100000+50617) + 1 ends in a 5

no need to use Mathematica for that:

2*7 = 14 ; + 1 = 15 .

Indeed a quite improbable prime.

> 2*(10^100000*50617) + 1 is divisible by 967 & 23473

This I cannot confirm, according to PARI, divisors < 5e5 are:

5,36263 for 2*(10^100000+50617) + 1

3,7,17,19 for 2*(10^100000+50617) - 1

3,17,19,23473 for 2*(10^100000*50617) + 1

11,167 for 2*(10^100000*50617) - 1

But in fact the " * " versions don't make sense

(why the "2" would be outside and 50617 inside the (...) ?)

Maximilian