Large Prime Factors!

Algebra Level 4

Given that there are three prime factors to the following expression and the smallest prime factor is the only prime factor which is a 22-digit number. Determine the smallest prime factor of

1+221+421 \large 1+2^{21}+4^{21}

Image Credit: Wikimedia Prime
Christopher Boo by Christopher Boo
×

Problem Loading...

Note Loading...

Set Loading...