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 Dec20 awarded Yearling Sep30 awarded Explainer May31 awarded Mortarboard Apr26 answered Can an odd perfect number be divisible by $5313$? Apr25 comment Can an odd perfect number be divisible by $5313$? @Anonymous-agroup I will give Ron Ford the honor. It was his idea, after all. Apr25 comment Can an odd perfect number be divisible by $5313$? @Anonymous-agroup Because the abundancy index of a perfect number must be $2$. Apr25 comment Can an odd perfect number be divisible by $5313$? @RonFord Also note that $$\left(\sum_{k=0}^4 \frac{1}{3^k}\right)\left(\sum_{k=0}^4 \frac{1}{7^k}\right)\left(\sum_{k=0}^4 \frac{1}{11^k}\right)\left(1 + \frac{1}{23}\right) > 2.$$ Apr25 answered $4 \times 3$ matrix, do rows span span $\mathbb{R}^3$ ? do columns span $\mathbb{R}^4$? Dec21 comment Solving $f'''+\frac{n+1}{2}ff''-nf'^2+n=0$ with $n=e^\pi$ Your equation is similar to the Falkner–Skan equation in fluid mechanics. With $n=0$ you obtain the Blasius equation. I would suggest to read some papers about them. Dec20 awarded Yearling Dec15 revised Verifying that $2^{44}-1$ is divisible by $89$ improved formatting Dec15 suggested approved edit on Verifying that $2^{44}-1$ is divisible by $89$ Dec11 revised Can I use my powers for good? corrected capitalisation and grammar Dec10 revised Show that there is no simple group of order $6\cdot{p}^m$ for any prime $p$ and positive integer $m$ improved formatting Dec10 suggested approved edit on Show that there is no simple group of order $6\cdot{p}^m$ for any prime $p$ and positive integer $m$ Dec10 revised Show that $|G|=1000$ is not simple improved formatting Dec10 suggested approved edit on Show that $|G|=1000$ is not simple Dec10 answered Two questions about order of subgroups Nov11 revised In this exercise, we will show that given any integer M, there exist infinitely many pries p such that M improved formatting Nov11 reviewed No Action Needed which is larger number? $\sqrt{7}-\sqrt{6}$ or $\sqrt{6}-\sqrt{5}$