Timeline for For which $n$ is $\sum_{k=1}^n 1 / \varphi(k)$ an integer?
Current License: CC BY-SA 4.0
8 events
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| Jan 15, 2022 at 15:24 | history | edited | Max Alekseyev | CC BY-SA 4.0 |
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| Jan 15, 2022 at 15:17 | comment | added | Max Alekseyev | @BrianHopkins: Adding just one more prime 743 into consideration extends the absence of solutions to the interval $[11,19319)$. | |
| Jan 15, 2022 at 15:15 | comment | added | Brian Hopkins | Can confirm that Mathematica finds only the solutions $n=1,2,4$ up to 10,000. | |
| Jan 15, 2022 at 14:59 | history | edited | Max Alekseyev | CC BY-SA 4.0 |
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| Jan 15, 2022 at 14:47 | history | undeleted | Max Alekseyev | ||
| Jan 15, 2022 at 14:47 | history | edited | Max Alekseyev | CC BY-SA 4.0 |
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| Jan 15, 2022 at 14:42 | history | deleted | Max Alekseyev | via Vote | |
| Jan 15, 2022 at 14:36 | history | answered | Max Alekseyev | CC BY-SA 4.0 |