Here is a set of numbers arranged regularly: 1,3 / 4,2 / 3,5 / 8,3 / 5

Here is a set of numbers arranged regularly: 1,3 / 4,2 / 3,5 / 8,3 / 5

One in 122
2=1*1+1,
3=2*2-1,
10=3*3+1,
15=4*4-1,
26=5*5+1,
The 11th one is: 11 * 11 + 1 = 122 (11 is odd, should add 1)