Timeline for Kindda-Perfect number: Is there a sequence of numbers which are equal to the sum of its proper divisors excluding itself as well as 1?
Current License: CC BY-SA 3.0
7 events
| when toggle format | what | by | license | comment | |
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| Jun 15, 2020 at 7:27 | history | edited | CommunityBot |
Commonmark migration
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| May 10, 2017 at 8:32 | comment | added | Federico Poloni |
Checked up to $10^6$ in a few seconds with this Sage one-liner and there are none: [n for n in srange(1, 10^6+1) if sigma(n) == 2*n+1]. :)
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| May 9, 2017 at 20:04 | vote | accept | Nikhil Bhavar | ||
| May 9, 2017 at 19:25 | answer | added | Carlo Beenakker | timeline score: 20 | |
| May 9, 2017 at 19:18 | comment | added | მამუკა ჯიბლაძე | Checked up to 1500, there are none. Several length two cycles, though, like $48\mapsto75\mapsto48$, $140\mapsto195\mapsto140$, $1050\mapsto1925\mapsto1050$, ... | |
| May 9, 2017 at 19:03 | review | First posts | |||
| May 9, 2017 at 19:09 | |||||
| May 9, 2017 at 19:01 | history | asked | Nikhil Bhavar | CC BY-SA 3.0 |