(a+1)(a2+1)(a4+1)(a6+1)(a8+1)+1=
[(a-1)(a+1)(a2+1)(a4+1)(a6+1)(a8+1)]/(a-1)+1=
[(a2-1)(a2+1)(a4+1)(a6+1)(a8+1)]/(a-1)+1=
[(a4-1)(a4+1)(a6+1)(a8+1)]/(a-1)+1=
(a8-1))(a8+1))(a6+1)]/(a-1)+1=
=[(a16-1)(a6+1)]/(a-1)+1
(a+1)(a2+1)(a4+1)(a6+1)(a8+1)+1=
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