SOLUTION: 7,21,8,72,9,

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Question 1033240: 7,21,8,72,9,

Answer by Edwin McCravy(20056) About Me  (Show Source):
You can put this solution on YOUR website!
7,21,8,72,9,
Start with 7:

multiply 7 by 31 or 3,
get 7*3=21.
Next term is 8. 
multiply 8 by 32 or 9,
get 8*9=72.
Next term is 9. 
multiply 9 by 33 or 27,
get 9*27=243.
Next term is 10. 
multiply 10 by 34 or 81,
get 10*81=810.

Etc., etc.

7,21,8,72,9,243,10,810,11,2673,12,8748,13,28431,14,91854,15,295245,...

Edwin