3 9 4 13 July 8, 2019 16 32 64 128 7x 3 4 9 13 5 3 4 6 9 13 3 4 6 9 13 sequence formula 3 4 6 9 13 what is the next number in the series 3 4 8 9 13 3 4 7 9 13 3 4 9 13 as ratio of integers 9 3 4 x 13 1 2 frame 1 3 4 9 13 9 3 4 x 13 frame 9 3 4 x 13 9 3/4 divided by 13 3 4 6 9 13 what comes next 3 4 6 9 13 next series 3 9 13 )- 5y 4