Question

1,2,6,15,31,56,91 wrong one?

Answer 1

91 is the wrong one.

Correct answer is ,92.

Explanation:

1+1²=2

2+2²=2+4=6

6+3²=6+9=15

15+4²=15+16=31

31+5²=31+25=56

56+6²=56+36=92.