In the following number series only one number is wrong. Find out the wrong number.
4, 5, 12, 38, 160, 805, 4836
The pattern followed is :
4 $$\times 1 + 1$$ = 5
5 $$\times 2 + 2$$ = 12
12 $$\times 3 + 3$$ = 39
39 $$\times 4 + 4$$ = 160
160 $$\times 5 + 5$$ = 805
805 $$\times 6 + 6$$ = 4836
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