75 ( 25 & 50)

25 is the smallest square that can be written as a sum of 2 squares.  

( 25 = 3^2 + 4^2 )

AND

50 is the smallest number that can be written as the sum of of 2 squares in 2 ways.

( 50 = 5^2 + 5^2  and  50 = 1^2 + 7^2 )