Question

next number in the series 1,3,7,13,21,31

Answer 1

The next number will be.. 43
(31+12)

Answer 2

1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,222,23,24,25,26,27,28,29,30,31