DESCRIPTION:
http://www.bouncemetronome.com/metronome_fractional_harmonic.htm Π beats to a measure.

Π is the circumference of a disk with diameter 1. Notice how the beats nearly coincide at 22 beats and 7 "measures" - the famous close approximation to Π as 22/7.

At the next good approximation, 355/113. they will seem to exactly coincide. That's because 355/113 is correct to 7 decimal places - so there's much less than a millisecond between them

The musical interval is a major sixth roughly a tenth tone flat (781.7954 cents)

see http://bouncemetronome.com - one of the many rhythms you can make with this versatile metronome.