Friendly Numbers
Two numbers sharing the same abundancy ratio, and the open question of whether 10 has a partner at all.
Math
Number-theory curiosities and the open questions hiding behind them.
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A Pressing Appointment
A clock-face counting trick that reliably lands on 1, no matter where you start.
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Of Thee I Sing
Why a 4-line poem has exactly 15 possible rhyme schemes — the same count as partitioning a set.