Are there distinct positive integers a,b,n for which:
1/n = 1/a^2+1/b^2,
?
If so, find the triplet with lowest n.
Yes, there are.
The smallest I have found are 5,10,20 and 10,5,20.
1/25 + 1/100 = 5/100 = 1/20
Smaller n might be possible, but I doubt it