77th-octave temperaments

Fractional-octave temperaments

---

← 76th-octave • 77th-octave • 78th-octave →

Iridium

Iridium is named after 77th element, being period-77. It also has a generator that is roughly 377 cents and is supported by 7777edo.

Subgroup: 2.3.5.7.11.13.17

Comma list: 12376/12375, 63792/67375, 194481/194480, 396833125/396829664, 112435984089/112394240000

Mapping: [⟨77 1 203 313 339 527 460], ⟨0 5 -1 -4 -3 -10 -6]]

mapping generators: ~429/425 = 1\77, 975/784 = 377.269

Optimal ET sequence: 385, 1848, 7777