(2+1)(2^2+1)(2^4+1)……(2^2n+1)

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(2+1)(2^2+1)(2^4+1)……(2^2n+1)

(2+1)(2^2+1)(2^4+1)……(2^2n+1)
(2+1)(2^2+1)(2^4+1)……(2^2n+1)

(2+1)(2^2+1)(2^4+1)……(2^2n+1)
(2+1)(2^2+1)(2^4+1)……(2^2n+1)
=(2-1)*(2+1)(2^2+1)(2^4+1)……(2^2n+1)
=(2^2-1)*(2^2+1)(2^4+1)……(2^2n+1)
=(2^4-1)*(2^4+1)……(2^2n+1)
.
=(2^2n-1)(2^2n+1)
=2^4n-1

(2+1)(2^2+1)(2^4+1)……(2^2n+1)=2^4n-1