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Mar
18
awarded  Nice Question
Feb
12
awarded  Popular Question
Jan
7
awarded  Pundit
Dec
19
comment An infinitely powered expression
$x=4$ is another solution. For more infore read: algebra.com/algebra/homework/logarithm/… .
Nov
18
awarded  Enlightened
Nov
18
awarded  Nice Answer
Oct
28
comment Solutions of diophantine eq: $x^4-2x^3y+2xy^3+y^4=2s^2$
I think it is unlikely to have a familiy of solutions with a single parameter to a single equation with three parameters. ¿Why do you ask, how or where did you find this problem?. ¿Do we have any reason to think that it is tractable?
Oct
7
asked Yet another curious convolution
Oct
7
comment What is the most surprising result that you have personally discovered?
@costrom mingw.org was my key then, no need to change SO :)
Oct
7
comment What is the most surprising result that you have personally discovered?
@costrom I searched for my code and modified it to search until $10^7$, took about 20 secs in a decent laptop to run this (WARNING: written when I was a young wannabe hacker kid :p ), multiplying by $10^4$ and dividing by $24\times3600$ gives around $2$ days. The magic of GMP mpz_legendre, I suppose.
Oct
1
awarded  Nice Answer
Sep
24
revised Curious convolution
added 2 characters in body
Sep
21
comment Curious convolution
@IvanNeretin That's nice. Well, just for fun we may use the identity $\sinh(x)\cosh(x)=2\sinh(x)$. I don't know if there is some result about the power series of a known power series or hyperbolic functions specificly, but maybe somthing interesting shows up.
Sep
21
revised Curious convolution
deleted 84 characters in body
Sep
21
asked Curious convolution
Sep
8
comment How many open knight's tours are possible in a 3×16 chessboard?
Before they close the question(altough I don't agree), I'd like to keep contact to investigate further. You may write me to chubakueno@gmail.com :) .
Sep
8
comment How many open knight's tours are possible in a 3×16 chessboard?
At hindsight, I don't see a problem with the symmetries you are using or with your brute force search. It is easy to modify the program to list every solution without much overhead, and verifying that all of them are different and valid should be really easy. Later, I will leave my PC working overnight and see what happens.
Sep
1
awarded  Popular Question
Aug
14
awarded  Yearling
Aug
9
awarded  Nice Question