algebra

[rocky dove]

1. Wait patiently for a helper to come along.
2. Once someone helps you, say thank you and close the thread with:

+close

3. Feel free to nominate the person for helper of the week in #helper-nominations
4. Do not ping the mods, unless someone is breaking the rules.
5. If you're happy with the help you got here, and the server overall, you can contribute financially as well: https://www.patreon.com/mathsdiscord

[wheat ridge]

mathgrinder

[round zodiac]

Really?

[finite star]

lmao

[round zodiac]

I saw that ping

[finite star]

AGAIN

[green walrus]

Don't ping us

[finite star]

IT HAPPENED AGAIN

[green walrus]

John calm down

bro

that's not something you can say

[finite star]

jk idc

[tribal wave]

I got pinged

So sad

[green walrus]

Mod ping, guys chill

[round zodiac]

To find $f(k)$ for a given $k$:

$(n-1)! + k$ is divisible by $n$ if and only if $(n-1)!$ has the same remainder when divided by $n$ as $-k$ does. For a given $k$, we just need to count the $n$ where this occurs.

[wheat ridge]

newatlantics

mathgrinder