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 Jan 20 comment Repeating last non-zero digits of factorial Jan 20 comment Repeating last non-zero digits of factorial As it should, as there is now one trailing zero... Jan 20 comment Repeating last non-zero digits of factorial This formula tells me how many 2's and fives are sucked up: $$\sum _{i=0}^k \left\lfloor \frac{n}{5^i}\right\rfloor$$ How can I combine this to make it work out right? Jan 20 comment 'Cosine'-esque function with flat peaks and valleys I think your function looks better as $$\tanh \left(\frac{6 \sin ^{-1}(\cos (x))}{\pi }\right)$$. Makes it easier to see what is going on. Jan 20 comment 'Cosine'-esque function with flat peaks and valleys When you say large peaks and valleys, do you mean flat peaks and valleys, or something else? Jan 20 comment Repeating last non-zero digits of factorial How does that not account for all of the numbers that only have one non-zero digit? Jan 20 comment Repeating last non-zero digits of factorial So you are saying that for 1000!, I should do 100!*10! and then take the last digits, and it will work out? Jan 19 comment Repeating last non-zero digits of factorial I don't really agree. The fact that it is divisible by eight just means that there are at least 3 zero's after any number. It tells me nothing about the lat non-zero digit. Jan 19 asked Repeating last non-zero digits of factorial Jan 3 awarded Nice Question Dec 8 accepted Binary function that is distributive, associative, commutative Dec 8 comment Binary function that is distributive, associative, commutative Ah, got it I understand. Dec 8 comment Binary function that is distributive, associative, commutative So thats just multiplication? Dec 8 comment Binary function that is distributive, associative, commutative How can I turn this into a function with conventional symbols? Dec 8 comment Binary function that is distributive, associative, commutative @ArturoMagidin, fixed, thanks. No need, but it would be interesting Dec 8 revised Binary function that is distributive, associative, commutative deleted 12 characters in body Dec 8 comment Binary function that is distributive, associative, commutative Pardon my ignorance, but what does that mean? Dec 8 asked Binary function that is distributive, associative, commutative Dec 3 accepted When is $\sin(x)$ rational? Dec 2 revised When is $\sin(x)$ rational? added 160 characters in body