218edo

218edo, having a step size of 5.50458715596 cents, contains very accurate ratios, such as 7/4, 11/8, 9/7, 8/7, 9/8, 10/9, 11/10 and 17/16, and its step size can be approximated as 5.5 cents.

Bold numbers are off within less than 0.1 step size

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

^ this isn't patent val

Suggested subgroups: 2.9.7.17 and 2.9.5.7.11.17.

Also explore 436edo.

Commas using the 13-limit patent val:

3-limit: 1/1

5-limit: 20000/19683

7-limit: 4000/3969 65625/65536 245/243 2401/2400 60025/59049

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

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