The general term formula of 3 / 2,1,7 / 10,9 / 17

The general term formula of 3 / 2,1,7 / 10,9 / 17

It's 3 / 2, 5 / 5, 7 / 10, 9 / 17
The numerator is an increasing odd number, and the denominator is 1,2,3.. square plus 1
That is, (2n + 1) / (N2 + 1) n = 1,2,3