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 Jan29 revised A question about proving that there is no greatest common divisor Removed thanks, added clear question. Jan29 suggested approved edit on A question about proving that there is no greatest common divisor Jan29 comment Expression that hits integer multiples of two variables @CamMcLeman, Henning, edited, you are correct. Jan29 revised Expression that hits integer multiples of two variables added 33 characters in body Jan29 asked Expression that hits integer multiples of two variables Jan21 accepted Repeating last non-zero digits of factorial Jan20 comment Repeating last non-zero digits of factorial Jan20 comment Repeating last non-zero digits of factorial As it should, as there is now one trailing zero... Jan20 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? Jan20 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. Jan20 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? Jan20 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? Jan20 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? Jan19 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. Jan19 asked Repeating last non-zero digits of factorial Jan3 awarded Nice Question Dec8 accepted Binary function that is distributive, associative, commutative Dec8 comment Binary function that is distributive, associative, commutative Ah, got it I understand. Dec8 comment Binary function that is distributive, associative, commutative So thats just multiplication? Dec8 comment Binary function that is distributive, associative, commutative How can I turn this into a function with conventional symbols?