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IMO Shortlist 2014 N5
hajimbrak   58
N an hour ago by Jupiterballs
Find all triples $(p, x, y)$ consisting of a prime number $p$ and two positive integers $x$ and $y$ such that $x^{p -1} + y$ and $x + y^ {p -1}$ are both powers of $p$.

Proposed by Belgium
58 replies
+1 w
hajimbrak
Jul 11, 2015
Jupiterballs
an hour ago
Integer a_k such that b - a^n_k is divisible by k
orl   69
N an hour ago by ZZzzyy
Source: IMO Shortlist 2007, N2, Ukrainian TST 2008 Problem 10
Let $b,n > 1$ be integers. Suppose that for each $k > 1$ there exists an integer $a_k$ such that $b - a^n_k$ is divisible by $k$. Prove that $b = A^n$ for some integer $A$.

Author: Dan Brown, Canada
69 replies
orl
Jul 13, 2008
ZZzzyy
an hour ago
interesting function equation (fe) in IR
skellyrah   1
N an hour ago by CrazyInMath
Source: mine
find all function F: IR->IR such that $$ xf(f(y)) + yf(f(x)) = f(xf(y)) + f(xy) $$
1 reply
skellyrah
3 hours ago
CrazyInMath
an hour ago
Find maximum area of right triangle
jl_   1
N an hour ago by navier3072
Source: Malaysia IMONST 2 2023 (Primary) P4
Given a right-angled triangle with hypothenuse $2024$, find the maximal area of the triangle.
1 reply
jl_
2 hours ago
navier3072
an hour ago
Erasing a and b and replacing them with a - b + 1
jl_   1
N 2 hours ago by maromex
Source: Malaysia IMONST 2 2023 (Primary) P5
Ruby writes the numbers $1, 2, 3, . . . , 10$ on the whiteboard. In each move, she selects two distinct numbers, $a$ and $b$, erases them, and replaces them with $a+b-1$. She repeats this process until only one number, $x$, remains. What are all the possible values of $x$?
1 reply
jl_
2 hours ago
maromex
2 hours ago
Prove that sum of 1^3+...+n^3 is a square
jl_   2
N 2 hours ago by NicoN9
Source: Malaysia IMONST 2 2023 (Primary) P1
Prove that for all positive integers $n$, $1^3 + 2^3 + 3^3 +\dots+n^3$ is a perfect square.
2 replies
jl_
2 hours ago
NicoN9
2 hours ago
x^3+y^3 is prime
jl_   2
N 2 hours ago by Jackson0423
Source: Malaysia IMONST 2 2023 (Primary) P3
Find all pairs of positive integers $(x,y)$, so that the number $x^3+y^3$ is a prime.
2 replies
jl_
2 hours ago
Jackson0423
2 hours ago
EGMO magic square
Lukaluce   16
N 2 hours ago by zRevenant
Source: EGMO 2025 P6
In each cell of a $2025 \times 2025$ board, a nonnegative real number is written in such a way that the sum of the numbers in each row is equal to $1$, and the sum of the numbers in each column is equal to $1$. Define $r_i$ to be the largest value in row $i$, and let $R = r_1 + r_2 + ... + r_{2025}$. Similarly, define $c_i$ to be the largest value in column $i$, and let $C = c_1 + c_2 + ... + c_{2025}$.
What is the largest possible value of $\frac{R}{C}$?

Proposed by Paulius Aleknavičius, Lithuania
16 replies
Lukaluce
Apr 14, 2025
zRevenant
2 hours ago
A colouring game on a rectangular frame
Tintarn   1
N 2 hours ago by pi_quadrat_sechstel
Source: Bundeswettbewerb Mathematik 2025, Round 1 - Problem 4
For integers $m,n \ge 3$ we consider a $m \times n$ rectangular frame, consisting of the $2m+2n-4$ boundary squares of a $m \times n$ rectangle.

Renate and Erhard play the following game on this frame, with Renate to start the game. In a move, a player colours a rectangular area consisting of a single or several white squares. If there are any more white squares, they have to form a connected region. The player who moves last wins the game.

Determine all pairs $(m,n)$ for which Renate has a winning strategy.
1 reply
Tintarn
Mar 17, 2025
pi_quadrat_sechstel
2 hours ago
Sum and product of 5 numbers
jl_   0
2 hours ago
Source: Malaysia IMONST 2 2023 (Primary) P2
Ivan bought $50$ cats consisting of five different breeds. He records the number of cats of each breed and after multiplying these five numbers he obtains the number $100000$. How many cats of each breed does he have?
0 replies
jl_
2 hours ago
0 replies
k 1000th Post!
PikaPika999   8
N Apr 5, 2025 by PikaPika999
When I had less than 25 posts on AoPS, I saw many people create threads about them getting 1000th posts. I thought I would never hit 1000 posts, but here we are, this is my 1000th post.

As a lot of users like to do, I'll write my math story:

Daycare
Preschool
Kindergarten
First Grade
Second Grade
Third Grade
Fourth Grade
Fifth Grade
Sixth Grade
Quick Quote that was from MLK that I edited

In conclusion, AoPS has helped me improve my math. I have also made many new friends on AoPS!

Finally, I would like to say thank you to all the new friends I made and all the instructors on AoPS that taught me!

Minor side note, but
8 replies
PikaPika999
Apr 5, 2025
PikaPika999
Apr 5, 2025
1000th Post!
G H J
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PikaPika999
1312 posts
#1 • 1 Y
Y by evt917
When I had less than 25 posts on AoPS, I saw many people create threads about them getting 1000th posts. I thought I would never hit 1000 posts, but here we are, this is my 1000th post.

As a lot of users like to do, I'll write my math story:

Daycare
Preschool
Kindergarten
First Grade
Second Grade
Third Grade
Fourth Grade
Fifth Grade
Sixth Grade

In conclusion, AoPS has helped me improve my math. I have also made many new friends on AoPS!

Finally, I would like to say thank you to all the new friends I made and all the instructors on AoPS that taught me!

Minor side note, but

Z Y
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evt917
2345 posts
#2 • 1 Y
Y by PikaPika999
congrats on 1000 posts!
Z Y
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PikaPika999
1312 posts
#3
Y by
Thank you so much!

uh oh this is my 1001st post, now i'm kinda sad :( :( :(
This post has been edited 2 times. Last edited by PikaPika999, Apr 5, 2025, 11:40 PM
Z Y
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HacheB2031
382 posts
#4 • 1 Y
Y by PikaPika999
Great job! :coolspeak: I hope you are doing well and advancing in the AoPS community!
Z Y
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PikaPika999
1312 posts
#5
Y by
HacheB2031 wrote:
Great job! :coolspeak: I hope you are doing well and advancing in the AoPS community!

Thanks! I hope you're doing well too!
Z Y
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Soupboy0
339 posts
#6 • 1 Y
Y by PikaPika999
PikaPika999 wrote:
Thank you so much!

uh oh this is my 1001st post, now i'm kinda sad :( :( :(

$1001 = 7 \cdot 11 \cdot 13$
$1002 = 2 \cdot 3 \cdot 167$
nice :gleam:
Z Y
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PikaPika999
1312 posts
#7
Y by
Soupboy0 wrote:
PikaPika999 wrote:
Thank you so much!

uh oh this is my 1001st post, now i'm kinda sad :( :( :(

$1001 = 7 \cdot 11 \cdot 13$
$1002 = 2 \cdot 3 \cdot 167$
nice :gleam:

lol niceeee :cool: :gleam: :cool: :gleam: :cool:
This post has been edited 2 times. Last edited by PikaPika999, Apr 5, 2025, 11:45 PM
Z Y
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jkim0656
949 posts
#8 • 1 Y
Y by PikaPika999
CONGRATTTSSSSS!!!! YAYAYAYA :wow:
Z Y
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PikaPika999
1312 posts
#9
Y by
jkim0656 wrote:
CONGRATTTSSSSS!!!! YAYAYAYA :wow:

Thank you so much!!! :w00t: :wow: :w00t: :wow: :w00t:
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