1 6 1 4 х 9 July 8, 2019 16 32 64 128 1 6 1 4 x 9 6 1 4 x 9 3 8 6 1 4 x 9 1 2 4 1 9 х =- 3 1 6 6 1 4 x 9 in fraction form 1 4 9 16 and 25 sequence 1 6+1 9