Jika N(t)=2^(2t-1) - 1. Maka N^-1(t)

y = 2^(2t-1)
2t - 1 = ²log y
2t = (²log y) - 1
2t = ²log y - ²log 2
2t = ²log (y/2)
t = {²log (y/2)} / 2
t = {²log (y/2)} / ²log 4
t = ⁴log (y/2)
N-¹(t) = ⁴log (t/2)