What is the missing number of the following sequence? 13, 39, 351, 35, ?, 85, 425, 210

Answer 1

13*3=39
39*9=351
35*1=35
35*5=175
17*5=85
85*5=425
42*5=210

so missing number is... 175

Answer 2

175 is the missing number in that sequence