Solution to the last riddle

The missing number:
1 18 136 959 5748 ? 114976 344931
      Answer & Explanation
Solution:
28745

Explanation
New Number = (Last Number +1 ) * 9 
and Then New Number = (Last Number - 1 ) * 8 and so on.

i.e
1
(1+1) * 9 = 18
(18-1) * 8 = 136
(136+1) * 7 = 959
(959-1) * 6 = 5748
(5748+1) * 5 = 28745
(28745-1) * 4 = 114976
(114976+1) * 3 = 344931

Very nice, but need to be thoughtful to discover
Très gentil, mais il faut être réfléchie à découvrir

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