List of intervals in 5-limit just intonation
The intervals of 5-limit just intonation (prime limit, not odd limit) are ratios involving only the powers of 2, 3, and 5. The fundamental intervals are the superparticular ratios 2/1 (the octave), 3/2 (the perfect fifth) and 5/4 (the major third).
Source: Wikipedia — List of intervals in 5-limit just intonation (CC BY-SA 4.0)