Similar to how the divisor summatory function, $D(x)$, is equal to $\sum_{n=1}^x \lfloor \frac xn \rfloor$, is there a similar function for $\sum_{n=1}^x \lfloor \frac xn \rfloor^2$?
2026-03-28 08:27:56.1774686476
Sum of Squares of Floor Function
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