Friedman numbers are numbers that can be made using just their digits, and the / () + - ^ operators.
25 is the lowest, being 5^2
There are just seven such numbers between 0 and 200, 25, 121, 125, 126, 127, 128, 153, It's quite a nice puzzle to figure out how each of these can be made,
also, if anyone can be bothered, 987654321 and 123456789 are Friedman, can you find the sum?
Find the answers here