18/17
18/17 |1 2 0 0 0 0 -1>
98.9546 cents
In 17-limit Just Intonation, 18/17 is the "small septendecimal semitone" of about 99¢. It is very close to 12edo's "half step" of 100¢, and fairly close to the "large septendecimal semitone" of 17/16 (~105¢).