A = ( 2 + 1 )( 22 + 1 )...( 2256 + 1 ) + 1
A = ( 2 - 1 )( 2 + 1 )( 22 + 1 )( 24 + 1 )...( 2256 + 1 ) + 1
A = ( 22 - 1 )( 22 + 1 )( 24 + 1 )...( 2256 + 1 ) + 1
A =( 24 - 1 ) ( 24 + 1 )...( 2256 + 1 ) + 1
A = ( 2256 - 1 )( 2256 + 1 ) + 1
A = 2512