Q:

Treasure hunt question

A series of numbers is given in the question and it could be anything. Have tried  things related to temperature values etc. but none worked. 
Guessing the next number in this series looks highly unlikely.
16 18 20 62

Hint: Answer is a 7 letter word.

A:

I think it is

 Sarcasm
 These are the atomic numbers of the elements with symbols  S = 16 Ar = 18 Ca = 20 Sm = 62

