4(5+1)(5²+1)(5四次方+1)(5八次方+1)+1
=(5-1)(5+1)(5²+1)(5四次方+1)(5八次方+1)+1
=(5²-1)(5²+1)(5四次方+1)(5八次方+1)+1
=(5四次方-1)(5四次方+1)(5八次方+1)+1
=(5八次方-1)(5八次方+1)+1
=5十六次方-1+1
=5十六次方
4(5+1)(5²+1)(5四次方+1)(5八次方+1)+1
=(5-1)(5+1)(5²+1)(5四次方+1)(5八次方+1)+1
=(5²-1)(5²+1)(5四次方+1)(5八次方+1)+1
=(5四次方-1)(5四次方+1)(5八次方+1)+1
=(5八次方-1)(5八次方+1)+1
=5十六次方-1+1
=5十六次方