Prime factor of $A=14^7+14^2+1$ Find a prime factor of $A=14^7+14^2+1$. Obviously without just computing it.

Same solution as Jyrki's, written differently
$$A=14^7+14^2+1=14^7-14+(14^2+14+1)\\
=14(14^6-1)+(14^2+14+1)=14(14-1)(14^2+14+1)(14^3+1)+(14^2+14+1)$$
