3-7-9-11-13-15 pentadekany
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A 15-odd-limit pentadekany. This creates a scale of 1 15/14 13/12 65/56 33/28 5/4 9/7 39/28 3/2 11/7 45/28 143/84 11/6 13/7 55/28 2/1, with steps of 15/14 91/90 15/14 66/65 35/33 36/35 13/12 14/13 22/21 45/44 143/135 14/13 78/77 55/52 56/55. With four perfect fifths, plus imperfect but still diatonic ones flat by 105/104 and sharp by 144/143, this has more than enough stable chords available to compose with, but like most scales this size, also has several comma steps, giving you more dissonant sounds available as well to create tension.
! 3-7-9-11-13-15_Pentadekany.scl ! 3 7 9 11 13 15 2-combination Pentadekany 15 ! 119.442 138.572 258.015 284.447 386.313 435.084 573.656 701.955 782.492 821.397 921.064 1049.362 1071.701 1168.805 1200