6 2 3 7 4 9 July 8, 2019 16 32 64 128 6 x 3 2 x 7 8 4 9 The series 6 7 3 4 2 9 can be decoded as 5 12x 3 4 7 6 2 9x 9 10 6 5 x 3 2 7 4 3c 6 3 4 )- 9d 7 2