Four of the following are similar in some respect. Find the odd one?

Step-by-step solution

The given numbers can be written as follows: 143=12^2-1 ; 63=8^2-1 ; 195=14^2-1 ; 15=4^2-1 But 257=16^2+1 Obviously, except 257 others can be written in the form x^2-1 .