1-3-5-7-9-13 eikosany
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The second simplest possible eikosany. This creates a scale of 1 21/20 13/12 9/8 91/80 7/6 39/32 13/10 21/16 7/5 117/80 3/2 91/60 63/40 13/8 273/160 7/4 9/5 91/48 39/20, with steps of 21/20 65/63 27/26 91/90 40/39 117/112 16/15 105/104 16/15 117/112 40/39 91/90 27/26 65/63 21/20 40/39 36/35 455/432 36/35 40/39. With several large steps around its line of symmetry and three microsteps that blur into their neighbours, this is definitely more uneven than the simplest eikosany, but still has more than enough perfect fifths and major thirds that you can compose non-xenharmonic sounding music using the right subset of it.
! 1-3-5-7-9-13_Eikosany.scl ! 1 3 5 7 9 13 3-combination Eikosany 20 ! 84.467 138.572 203.910 223.039 266.871 342.482 454.213 470.781 582.512 658.123 701.955 721.084 786.422 840.527 924.994 968.825 1017.596 1107.398 1156.168 1200