Thank you for giving me an idea to try to find a way to calculate this sum: $$S= \sum_{i=0}^n \lfloor\sqrt{i} \rfloor$$
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2This is the page for MathJax. – Toby Mak Sep 20 '19 at 08:55
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4In addition, this is a duplicate of Find a formula for $\sum\limits_{k=1}^n \lfloor \sqrt{k} \rfloor$. If you have any further questions, please see how to ask a good question and ask a new question including what you don't understand. – Toby Mak Sep 20 '19 at 08:55