3ado, if the attempt is made to use it as an actual scale, would divide the octave into three arithmetically equal parts. The notes of this ADO can be used to form a 3:4:5 triad, which can be used as the fundamental consonance in some non-octave tunings such as EDT in place of the 4:5:6 major triad.

Intervals

# Cents Ratio Interval name
0 0.0 1/1 perfect unison
1 498.0 4/3 just perfect fourth
2 884.4 5/3 just perfect sixth
3 1200.0 2/1 perfect octave