Obvious mistakes
I would like to point out a few mistakes.
1. (2^n) is never divisible by (n), (2^n2) is divisible by (n), when (n) is prime (btw, it is because of Little Fermat theorem)
2. (20471) /2= 186; you probably meant (20471)/11 = 186.
Apart from these typos, I guess I will leave the topic for other guys.
