1 4 x 2 9 16 July 8, 2019 16 32 64 128 1 4 x 2 9 16 bolt 1 4 x 2 9 x 3 16 1 4 x 3 2 9 16 0 1 4 x y 2 9 16 xy 2 1 4 9 16 and 25 sequence 1 4/9 x 2 1/4
