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Taking harmonic overtones 20 to 40, you can make a 20-note isoharmonic scale like this:

otone
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
freq. ratio
1/1
21/20
11/10
23/20
6/5
5/4
13/10
27/20
7/5
29/20
3/2
31/20
8/5
33/20
17/10
7/4
9/5
37/20
19/10
39/20
2/1
cents
0
84
165
242
316
386
454
520
583
643
702
759
814
867
919
969
1018
1065
1111
1156
1200

A reference chart to find cents values for every interval available in this scale:


20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
20
0
84
165
242
316
386
454
520
583
643
702
759
814
867
919
969
1018
1065
1111
1156
21
1116
0
81
157
231
302
370
435
498
559
617
674
729
782
834
884
933
981
1027
1072
22
1035
1119
0
77
151
221
289
355
418
478
537
594
649
702
754
804
853
900
946
991
23
958
1043
1123
0
74
144
212
278
341
401
460
517
572
625
677
727
776
823
869
914
24
884
969
1049
1126
0
71
139
204
267
328
386
443
498
551
603
653
702
749
796
841
25
814
583
979
1056
1129
0
68
133
196
257
316
372
427
481
532
583
631
679
725
770
26
746
830
911
988
1061
1132
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