Question

11,20,63,248,_______​

Answer 1

11 + (1^3 + 1) = 11 + 2 = 13

13 + (2^3 - 1) = 13 + 7 = 20

20 + (3^3 + 1) = 20 + 28 = 48

48 + (4^3 - 1) = 48 + 63 = 111

111 + (5^3 + 1) = 111 + 126 = 237.

So, the next number is 237 and the series is 11, 13, 20, 48, 111, 237.