AoPS Academy
[/quote]
, do not answer with "
is a solution" only. Either you post any kind of proof or at least something unexpected (like "
is the smallest solution). Someone that does not see that is a solution of the above without your post is completely wrong here, this is an IMO-level forum.
and 
be 2 distinct positive integers.
be in an integer. Prove why ?
is given. It turns out that for every positive integer number 
, for which the numbers 
and 
are positive, they have the same number of divisors. Is it necessarily true that 
?
with 
as its incenter. Let 
be the intersection of 
and 
and define 
in a similar way. Furthermore, let 
. Prove that if 
, then 
are concyclic.
positive integers. Product of any one of them with sum of remaining numbers increased by 
is divisible with sum of all numbers. Prove that sum of squares of all numbers is divisible with sum of all numbers
![$P \in \mathbb R[x,y]$](http://latex.artofproblemsolving.com/8/a/0/8a0576299e976c51607959fb68c7c742b2a49c6a.png)
with ![$P \not\in \mathbb R[x] \cup \mathbb R[y]$](http://latex.artofproblemsolving.com/a/f/7/af71ba8c643d5bd8a2928fa6714ccd91713bd641.png)
and 
homeomorphismes of 
, 
is an homoemorphisme too.
is inscribed in a circle centered at 
, and 
. Let 
be the second intersection point of the circumcircles of the triangles 
and 
.
, and are collinear.
and 
are the circumcenters of the triangles , and , respectively, prove that the points 
are concyclic.
where is a positive integer and 
is a prime.(Don't get mad at me,I've used the search function and did not see a correct and complete solution anywhere.)
![\[
2^a + 3^b + 1 = 6^c
\]](http://latex.artofproblemsolving.com/1/9/e/19eb5efa2ccdf54cd277339f8d3b99f75168779d.png)
is inscribed in circle 
. Let 
and denote its orthocenter and circumcenter, respectively. Let 
and 
be the midpoints of sides 
and 
, respectively. Rays 
and 
meet at 
and 
, respectively. Lines 
and 
meet at . Prove that 
.
satisfying both of the following properties:
.
.
with maximums 
and 
. If 
, and 
can be expressed as 
where is a positive integer, find .
and 
for each nonnegative integer 
. Prove that 
is the greatest integer less than or equal to 
, 
and 
. Prove that
Let and 
. Prove that
Let and 
. Prove that
Let and 
. Prove that
is obtained in each of the seven points, determine the smallest possible value for .
is obtained in each of the seven points, determine the smallest possible value for .
