( 2 + 1) ( $2^2$ + 1 ) ( $2^4$ + 1 ) ( $2^8$ + 1 )
⇔ ( 2 - 1 ) ( 2 + 1 ) ( $2^2$ + 1 ) ( $2^4$ + 1 ) ( $2^8$ + 1 )
⇔ ( $2^2$ - 1 ) ( $2^2$ + 1 ) ( $2^4$ + 1 ) ( $2^8$ + 1 )
⇔ ( $2^4$ - 1 ) ( $2^4$ + 1 ) ( $2^8$ + 1 )
⇔ ( $2^8$ - 1 ) ( $2^8$ + 1 )
⇔( $2^16$ - 1 )
Ta có: $2^{16}$ = 65536
⇔ 65536 - 1 = 65535
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