4 1 2 9 16 July 8, 2019 16 32 64 128 4 1 2 x 9 16 1 4 9 16 n 2 formula 1 4 9 16 n 2 formula proof 1 2 9 16 x 3 4 9 16 x 4 1 2 leaf spring bolt 2 4 8 х 1 3 9 16 4 1 2 divided by 9 16 1 4 x 2 9 16 bolt 1 2 4 9 16 sequence 1 4 x 3 2 9 16 0 9 16 4 1 2 bolt 9 16 x 4 1 2 grade 8 bolt 1 4 x y 2 9 16 xy 2 9 16 x 4 1 2 baseboard