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Jan
20
comment Repeating last non-zero digits of factorial
let us continue this discussion in chat
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