218edo: Difference between revisions

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-'''<span style="font-size: 400%;">218 equal divisions per octave</span>'''
+{{Infobox ET}}
+{{ED intro}}
-It contains very accurate ratios, here is the collection: 7/4, 11/8, 9/7, 8/7, 9/8, 10/9, 11/10, 17/16
+edo is in[[consistent]] to the [[5-odd-limit]], with [[harmonic]] [[3/1|3]] falling about halfway between its steps. However, it contains very accurate ratios, such as [[7/4]], [[9/7]], [[9/8]], [[10/9]], [[11/10]], [[17/16]], and [[19/16]], which are approximated within 0.55-cent deviation (10% the step size). The suggested [[subgroup]]s are therefore 2.9.7.17.19 and 2.9.5.7.11.17.19.23.
-'''Bold numbers are off within less than 0.1 step size'''
+Commas using the [[13-limit]] patent val:
-{| class="wikitable"
+; [[5-limit]]: 20000/19683, 1220703125/1207959552
-|-
-| | fraction:
-| | 3/2
-| | 4/3
-| | 5/4
-| | 8/5
-| | 5/3
-| | 6/5
-| | 7/4
-| | 8/7
-| | 10/9
-| | 9/5
-| | 9/8
-| | 16/9
-|-
-| | steps in 218edo:
-| | 128
-| | 90
-| | 70
-| | 148
-| | 161
-| | 57
-| | '''176'''
-| | '''42'''
-| | 33
-| | 185
-| | '''37'''
-| | '''181'''
-|}
-It's great for 2.9.7.17 subgroup, and good for 2.9.5.7.11.17 subgroup.
+; [[7-limit]]: 4000/3969, 65625/65536, 245/243, 2401/2400 117649/116640
-Tempers out 640000000000000000/635585924776181463 with patent 5, 7 and 9. This is the difference between three 7/4 ratios and sixteen 10/9 ratios stacked.
+; [[11-limit]]: 4000/3993, 12005/11979, 16384/16335, 4375/4356, 78125/77616, 896/891, 67228/66825, 1375/1372, 6875/6804, 5632/5625, 385/384, 94325/93312, 15488/15435, 75625/75264, 15488/15309, 3388/3375, 1331/1323, 6655/6561, 65219/64800, 43923/43904, 73205/72576,
-To handle accurate 3 along with everything mentioned, please explore [[436edo|436edo]].
+; [[13-limit]]: 28672/28561, 86240/85683, 20480/20449, 5600/5577, 16807/16731, 25000/24843, 6125/6084, 86625/86528, 68992/68445, 58080/57967, 96800/95823, 847/845, 41503/41067, 33275/33124, 65219/64896, 29575/29403, 4225/4224, 21632/21609, 676/675, 33124/32805, 9295/9261, 46475/45927, 13013/12960, 28561/28512
-[[Category:31edo]]
-[[Category:what_is]]
+=== Odd harmonics ===
-[[Category:wiki]]
+{{Harmonics in equal|218}}
+=== Subsets and supersets ===
+Since 218 factors into {{factorization|218}}, 218edo contains [[2edo]] and [[109edo]] as its subsets. [[436edo]], which doubles it, is worth exploring.