601 reputation
819
bio website soandos.wordpress.com
location Binghamton, NY
age 22
visits member for 3 years, 3 months
seen Aug 12 at 1:29

Student.

Third to earn the marshal badge on SuperUser

profile for soandos on Stack Exchange, a network of free, community-driven Q&A sites

profile for soandos on Project Euler, which exists to encourage, challenge, and develop the skills and enjoyment of anyone with an interest in the fascinating world of mathematics.


Jan
29
asked Expression that hits integer multiples of two variables
Jan
21
accepted Repeating last non-zero digits of factorial
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