Alkan uses an F triple sharp in at least 2 works: Quasi-Faust, the 2nd movement of Grande Sonate op.33: http://www.rsabey.pwp.blueyonder.co.uk/img/AlkanGrandeSonateP31Part.gif (lower stave, 2nd beat)
Allegretto alla barbaresca, the Concerto's 3rd movement, which is the 10th of the studies in the minor keys op.39: http://www.rsabey.pwp.blueyonder.co.uk/img/AlkanOp39No10P115Part.gif (lower stave, second bar, 4th note from the end) As far as I know, Chopin never used triple sharps or triple flats.
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