Question

P=24(7^2+1)(7^4+1)(7^8+1)(7^16+1)

Answer 1

P=24(7^2+1)(7^4+1)(7^8+1)(7^16+1)

=> 2P = 48(7^2+1)(7^4+1)(7^8+1)(7^16+1)

      = (7^2 - 1)(7^2+1)(7^4+1)(7^8+1)(7^16+1)

      = (7^4 - 1)(7^4+1)(7^8+1)(7^16+1)

      = (7^8 - 1)(7^8+1)(7^16+1)

      = (7^16 - 1)(7^16+1)

      = 7^32 - 1

 => P =  (7^32 - 1) / 2