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15/14
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119.44281 cents
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The septimal diatonic semitone, 15/14, is a superparticular ratio with a numerator which is the fifth triangular number.

It may be found as the interval between many 7-limit ratios, including:
  • 16/15 and 8/7
  • 14/13 and 15/13
  • 7/6 and 5/4
  • 6/5 and 9/7
  • 14/11 and 15/11
  • 4/3 and 10/7
  • 7/5 and 3/2
  • 22/15 and 11/7
  • 14/9 and 5/3
  • 8/5 and 12/7
  • 26/15 and 13/7
  • 7/4 and 15/8

http://en.wikipedia.org/wiki/Septimal_diatonic_semitone