N 3 1 July 8, 2019 16 32 64 128 N 3 )= 13 N 3 16 N 3 10 N 3 14 N 3 12 N 3 15 N 3 18 N 3 11 N 3 125 N 3 10 6 N 3 15 6 N 3 1 formula N 3 1 9 N 1 3 expand 3 n 1 start supco