4, 16, 37, 58, 89, 145, 42, 20

You may use any type of sequence to answer this question. Help:confused:

Its impossible to answer such a question

You take the sum of the squares of the digits of the previous term. It's not impossible at all.

In fact you have the whole sequence there, it just repeats from the beginning from that point. (the next terms are 4, 16, 37 etc.)