You might know about regular numbers (en.wikipedia.org/wiki/Regular_, of the form $$2^i\cdot3^j\cdot5^k$$) from Babylonian mathematics, music theory, Plato, or as a test case for functional programming. But did you know that they come up in biology, as numbers of years between mass flowering in certain types of bamboo? See Veller, Nowak and Davis, "Extended flowering intervals of bamboos evolved by discrete multiplication", doi.org/10.1111%2Fele.12442, via Andrey Zabolotskiy at oeis.org/A051037

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