9*0.5 + 0.5 = 5 5*1 + 1 = 6 6*1.5 + 1.5 = 10.5 10.5*2 + 2 = 23 23*2.5 + 2.5 = 60 60*3 + 3 = 183
So 61 is wrong in the series
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