Timeline for Integers n such that sigma(n)=omega(n)n and omega(n) divides n
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 14, 2013 at 20:33 | comment | added | Gerhard Paseman | And it looks like 30240 is another example. I suspect there are not many more. Gerhard "Ask Me About Premature Speaking" Paseman, 2013.05.14 | |
| May 14, 2013 at 18:51 | comment | added | Dietrich Burde | @Gerhard: Well, this can happen easily. By the way, integers $n\ge 1$ with $\sigma(n)=mn$ for some $m\ge 2$ are called m-multiple perfect numbers, and there are several of them (see matwbn.icm.edu.pl/ksiazki/mon/mon42/mon4204.pdf). | |
| May 14, 2013 at 18:03 | comment | added | Gerhard Paseman | Darn. Looks like I spoke too soon. I will see if I can prove that there are no other examples. Gerhard "Drats! Foiled Again By Counterexample!" Paseman, 2013.05.14 | |
| May 14, 2013 at 17:58 | vote | accept | Sylvain JULIEN | ||
| May 14, 2013 at 17:54 | history | answered | Dietrich Burde | CC BY-SA 3.0 |