3 (- 2 13 ) 7 July 8, 2019 16 32 64 128 3 (- 2 13 )+ 7 3 2 5 13 7 2 3 x 13 7 1 2 3 7 13 13 2 7x 3 2 75 13 3 2 3 7 8 13 2 3 13 7 4 2 3 5 7 13 prime numbers 7x 3 13 2 7x 6 17 12 3x 4 3 (- 4x 7 2 13 3 13 2h 2 7h X 3 5x 2 7x 13 2 3 7 8 13 sequence