SOLUTION: I need to know what the ? next number is in these two sequences: 2, 7, 26, 101, 400, ? 7, 21, 8, 72, 9, ?

Algebra ->  Sequences-and-series -> SOLUTION: I need to know what the ? next number is in these two sequences: 2, 7, 26, 101, 400, ? 7, 21, 8, 72, 9, ?      Log On


   

Question 1083306: I need to know what the ? next number is in these two sequences:
2, 7, 26, 101, 400, ?
7, 21, 8, 72, 9, ?
Answer by Edwin McCravy(20056) About Me  (Show Source):
You can put this solution on YOUR website!
  2*4 =    8, then    8 - 1 =    7
  7*4 =   28, then   28 - 2 =   26
 26*4 =  104, then  104 - 3 =  101
101*4 =  404, then  404 - 4 =  400 
400*4 = 1600, then 1600 - 5 = 1595

7
7*3 = 21
8
8*3*3 = 72
9
9*3*3*3 = 243

Edwin