The second number in the given number-pairs is obtained by performing certain mathematical operation(s) on the first number. The same operation(s) are followed in all the number-pairs EXCEPT one. Find that odd number-pair.

169 : 14

The logic followed here is :

( second number - 3)²  = ist number

169 : 14 ⇒ 14 - 3 = (11)² = 121 ≠ 169

225 : 18 ⇒ 18 - 3 = (15)² = 225

196 : 17 ⇒ 17 - 3 = (14)² = 196

256 : 19 ⇒ 19 - 3 = (16)² = 256