1) 5, 6, 9, 15, 25, 40


5 + 1 = 6
6 + (1 + 2) = 9
9 + (1 + 2 + 3) = 15
15 + (1 + 2 + 3 + 4) = 25
25 + (1 + 2 + 3 + 4 + 5) = 40

2) 3, 5, 13, 43, 177, 891, 5353.