(a+1)(a^2+1)(a^4+1)……(a^1024+1)

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(a+1)(a^2+1)(a^4+1)……(a^1024+1)(a+1)(a^2+1)(a^4+1)……(a^1024+1)(a+1)(a^2+1)(a^4+1)……(a^1024+1)(a+1)(a

(a+1)(a^2+1)(a^4+1)……(a^1024+1)
(a+1)(a^2+1)(a^4+1)……(a^1024+1)

(a+1)(a^2+1)(a^4+1)……(a^1024+1)
(a+1)(a^2+1)(a^4+1)……(a^1024+1)
=(a-1)(a+1)(a^2+1)(a^4+1)……(a^1024+1)/(a-1)
=(a^2-1)(a^2+1)(a^4+1)……(a^1024+1)/(a-1)
=.
=(a^2048-1)/(a-1)