Find out the wrong term in the following number series. 4, 16, 37, 58, 81.

The series follows the following pattern.

4

16 =  $42$

37 =  $12+62$

58 =  $32+72$

81  $\ne 52+82$.

Here every number is based on the digits of previous number. Hence, 81 is the wrong number in the given series.