39 ,126 , 2725 ,522 ,_,.............
Answer
39 , 126 , 2725 , 522 , _ ,.............
39 , 3+9 diff(3,9) 1+26 diff(1,26) 27+25 diff(27,25)
Next number 5+22 diff(5,22) = 2717
39 ,126 , 2725 ,522 ,2717 ,.............
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