Question

D=15(4^2+1)(4^4+1)...(4^64+1))

Answer 1

\(D=15(4^2+1)(4^4+1)...(4^{64}+1)\\=(4^2-1)(4^2+1)(4^4+1)...(4^{64}+1)\\=(4^4-1)(4^4+1)...(4^{64}+1)\\...\\=(4^{64}-1)(4^{64}+1)\\=4^{128}-1\\Vậy:D=4^{128}-1\)