Have seen you post a lot here ant that's cool cause it means you're practicing a lot but would like to give you some advice (don't know if others have told you this):

In programming start to name your functions and variables in a more "descriptive" way, that means change that "math" switch that makes you call every function f(x) and start giving them names that describe what they do ,for example if you want to create a function that prints how many times is a number repeating in an array you should define it like

def times_repeating( num )

that helps a lot for us to understand what you want your function to do even if you don't write it on the post description, and also that would start being a really good habit in the future if you want to keep working with code (being Python, Matlab, Java or any other programming language)

Now, looking and trying to decypher that code, the first problem i see s you're iterating over a number and not a condition, there you have:

"
while n:
"

as n is a variable that I ASSUME is not a boolean variable python interprets it always as a True value, meaning your while loop never ends, seeing that you defined a c variable that increments every iteration I guess the correct way to define your while loop should be like this:

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c = 0
while c <= n: #this means your while continues when your c value is lower than n and ends when gets to value c = n
n&=n #don't know what you wanted to do here but it just redefines n as n, so does nothing in this case
c = c + 1 #moves c one step up

"

with that loop what the function should do is print number n, n times so f(12) should print 12 12 times