MathForces: Math Olympiads
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School Clubs 500 3 Combinatorics
5th power equation 500 60 Algebra, Equations
2020 digit 200 433 Algebra, Digits
Cubical squares 100 536 Algebra, Exponents
Oh-matrix 300 129 Algebra, Linear-Algebra, Matrices
Fractions 300 90 Algebra
Prime Sets 500 8 Combinatorics, Number-Theory
Test 100 672
Special square 500 52 Number-Theory, Squares
Product of differences 300 96 Algebra, Inequalities
Numbers ratio 100 550 Algebra, Arithmetics
Reverse Product 400 33 Combinatorics, Number-Theory
Triangle in hyperbola 400 61 Algebra, Geometry, Coordinates
Viet said 500 94 Number-Theory
Sum of four 100 344 Combinatorics, Digits
Convex triangle 400 37 Geometry, Combinatorics
Small triangle 600 13 Geometry, Areas
2020 Palindromes 100 320 Combinatorics, Palindromes
Powers of 6 500 36 Number-theory, Equations
Relatively prime with 2020 200 205 Number-Theory, Prime-Numbers
Positive product of sums 300 59 Algebra, Equations, Number-Theory
C Sum 300 99 Algebra, Combinatorics, Formulas
Odd divisors 300 78 Number-Theory, Divisors
Inverse Sum in Triangle 500 10 Geometry
Squared fours 200 172 Number-Theory, Algebra
Divisibility by 4 200 196 Number-Theory, Digits
Integer sequence 400 8 Algebra, Sequences
Polynomial without 4 400 40 Algebra, Polynomials
Tricky sequence 500 28 Number-Theory, Algebra, Sequences
All such 400 61 Number-Theory, Equations
Interesting functions 600 12 Number-Theory
Friendly rooks 200 144 Combinatorics, Chess
Similar polynomials 500 47 Algebra, Polynomials
x[x] 400 48 Number-Theory, Floor-Function
Many digits 400 97 Algebra
Tricky polynomial 600 41 Algebra, Polynomials, Complex-Numbers
Cyclic Q 600 13 Geometry
Area of triangle 200 191 Geometry, Squares, Areas
First geometry 400 57 Geometry, Circles, Tangents
335577 500 32 Number-Theory, Powers
Sum of digits 2020 200 144 Number-Theory, Digits
Angle chasing 300 124 Geometry, Angle-Chasing
Progressive sequence 500 18 Algebra, Number-Theory, Sequences
One three-digit number 200 243 Algebra, Inequalities
Novirus 300 80 Combinatorics, Graphs
Tricky 400 60 Number-Theory
Permutational Polynomial 500 30 Algebra
Lin the Racoon's Debut 600 16 Combinatorics, Raccoon
What a function 400 37 Algebra, Functions
Hexagonial 300 10 Geometry, Hexagons
Just sequence 300 139 Algebra, Sequences
Divisible sets 300 5 Combinatorics
Odd factors 500 26
Concetric 200 58 Geometry
Teleporting button 300 8 Combinatorics, Probabilities
Almost squared numbers 300 41 Number-Theory
Zeros and Ones 300 17 Combinatorics
Lin's Octagon 300 42 Combinatorics
Pencils 400 7 Combinatorics
Prime powers 400 37
Function 300 188 Algebra, Functional-Equations
Minimizing Fibb 400 117 Algebra, Sequences
Exactly two roots 400 47 Number-Theory, Equations
Revolution 300 17 Combinatorics
Sqaure in square 600 35 Geometry, Squares
Orthocenter 600 12 Geometry, Circles, Tangents
Square multiples of 24 200 214
Simple expression 300 78 Algebra, Combinatorics
Tommorow's day 100 606 Algebra, Digits
NRD pair 200 89 Number-Theory, Prime-Numbers
Zero sequence 200 66 Algebra, Sequences
U turn 200 142 Algebra, Number-Theory, Digits
6 Apart 500 86 Geometry, 3D
Arithmetic derivative 500 39 Number-Theory, Functions
VNT 500 96 Number-Theory, LTE
Fancy meal 300 72
Switchers 400 44 Combinatorics, Sets
Sequenta 300 63 Algebra, Sequences
MTMTK System 400 19 Algebra, Equations
Parking 300 183 Combinatorics
New FE 300 48 Functional-Equations
Simple sum 300 26 Algebra, Sums
Cyclic Areas 300 23 Geometry, Areas
Concatenate 500 14 Number-Theory
Equilateral Triangles 200 202 Combinatorics, Grids
More dominos 400 29 Combinatorics
Random numbers 400 14 Algebra, Combinatorics
Weird games 500 20 Combinatorics
Cool-divisble numbers 300 64 Number-Theory, Digits
Rational Irrational 300 28 Algebra, Number-Theory
Random answer 100 415 Random
Gineq 300 47 Geometry
2+1 200 229 Algebra, Arithmetics
Semiperimeter 200 35 Geometry
Soccer Game 500 9 Combinatorics
Sum of Digits 200 60 Number-Theory, Digits
Digital Cubes 100 67 Algebra, Digits
Weird equation 200 187 Algebra, Polynomials
Powered Numbers (Duplicate) 300 49 Algebra, Number-Theory
Lin's Game 400 9 Combinatorics, Games
Max Area 300 33 Geometry
ADAD (Duplicate) 400 39 Geometry, Circles
Simple Altai 400 17 Number-Theory
MathForces Store 500 32 Combinatorics
Mathrix 600 2 Algebra, Number-Theory, Matrices
Expanding brackets 300 141 Algebra, Polynomials
Chords 300 10 Geometry, Circles
Lucky numbers 100 117 Digits, Algebra
Math lesson 400 39 Number-Theory, Combinatorics
Diameter 400 50 Geometry, Perpendiculars
New Cake 400 25 Geometry
Half of Octahedron 400 123 Combinatorics, Graphs
Small triangular numbers 200 128 Algebra, Number-Theory
Subsets Collection 600 25 Combinatorics, Sets
Sum of Squares 500 24 Geometry
Monochromatics 400 5 Combinatorics, Graphs
Almost fixed 400 10 Combinatorics, Algebra
Sequence 300 41 Number-Theory
Probability computer 300 12 Combinatorics
Flip 200 61 Algebra, Number-Theory, Digits
Point O 400 96 Geometry
ADAD 400 37 Geometry, Circles
Cuboid 300 26 Number-Theory
Four on a circle 400 43 Geometry, Circles
Also palindrome 400 43 Digits
Excirlce 400 2 Geometry
Rational Polynomial 400 24 Algebra, Polynomials
Powered Numbers 300 50 Algebra, Number-Theory
Polynomial Probability 600 26
Base4 300 30 Number-Theory
Friendly Team 400 10 Combinatorics
Odd polynomial 400 102 Algebra, Polynomials
Irreducible Fractions 200 62 Number-Theory
Smallest number 600 241 Algebra
Maximum of Minimum 500 25 Algebra, Inequalities
0,1,2 polynomial 400 20 Combinatorics, Algebra
Equiangular Hexagon 400 10
!Fancy FE 500 9 Algebra, Polynomials
Smallest degree 400 7 Algebra, Polynomials
Not fibbo 300 51 Algebra, Sequences
Temirlan's cake 100 683 Algebra, Arithmetics
Fill the square 400 16 Combinatorics, Algebra
Flights 500 9 Combinatorics, Graphs
Sum probability 300 75 Combinatorics, Algebra, Probablilities
Nice Integer 400 5 Number-Theory, Algebra, Polynomials
Rotating Hexagon 600 2 Geometry, Combinatorics
Triangle and Square 200 51 Geometry
Just Easy Sum 100 103 Algebra
5 instead of 1 200 175
!Fancy cubic 300 64 Algebra, Number-Theory
Bingo! 200 139 Combinatorics, Probabilities
Half Integers 500 2 Combinatorics, Geometry
6-sums 100 87 Algebra
Factorial Factor 200 54 Number-Theory, Combinatorics
Magic Ruler 500 5 Geometry, Combinatorics
Not your business 200 181 Geometry, Tangents
Binary Sum 500 23 Number-Theory, Algebra
Interesting permutations 600 2 Number-Theory
Again these rooks 600 56 Combinatorics, Boards
Seven eleven 200 49 Algebra
D Flags 200 70 Web-Search
Sharp inequality 500 9 Algebra, Inequalities
Cube Cube Square 300 24 Algebra, Number-Theory
Negative roots 300 22 Algebra
Not constant 300 22 Algebra, Number-Theory
Five Primes 100 99 Number-Theory
Triangle in Hexagon 200 47 Geometry, Probabilities
Lin's Numbers 400 28 Number-Theory, Algebra
Tan-Sin 500 37 Geometry, Trigonometry
!Fancy grid 700 8 Combinatorics, Graphs
Obtuser 400 18 Combinatorics, Geometry
Bools and cows 200 154 Random, Combinatorics
!Fancy polygon 400 38 Geometry, 3D
Number Coloring 400 21 Combinatorics
!Fancy sequence 600 8 Combinatorics, Number-Theory
Fancy polynomial 800 20 Algebra, Polynomials
Product of areas 300 38 Geometry
Quadratic 300 42 Algebra, Number-Theory
Ordered papers 300 31 Combinatorics
Rooks 600 14 Combinatorics
Hold me 500 17 Algebra
Functional Eq 700 15 Algebra, Functional-Equations
Poly 600 9 Algebra
Checkboard 600 3 Combinatorics
Love Triangle 400 5 Combinatorics
Pentagon 500 17 Geometry, Combinatorics, Pentagons
Air MF 500 5 Combinatorics
Nice polynomial 700 7 Algebra
Fancy limit 400 31 Algebra, Sequences
Total inversion 500 31 Combinatorics, Geometry
Money date 100 283 Combinatorics, Probabilities
Independence 300 10 Combinatorics, Probabilities
Circled 700 12 Geometry, Combinatorics
Good Order 600 3 Algebra, Number-Theory
Infinite game 500 38 Combinatorics, Games
Fancy integral 700 30 Algebra, Sums, Integrals
Quadratic Sets 400 6 Combinatorics, Sets, Algebra
Sharingan 500 10 Geometry
Solutions on the interval 300 54 Algebra, Equations
Regular Polygons 200 45 Geometry, Combinatorics
Too much 600 25 Algebra, Equations
These Triangles 300 9 Geometry, Combinatorics
Daniyar's Friends 300 27
Unfair Game 400 30 Combinatorics
Cemicirlces 300 11 Geometry, Areas
Discriminant 400 29 Algebra, Polynomials
Lin does shopping 200 24 Algebra, Number-Theory
Lin Jumper 500 14 Combinatorics
Where is my husband 500 23 Combinatorics, True-False
Administrative function 900 9
Fancy point 500 11 Geometry
Big set 400 15 Combinatorics
Friends Playing 600 17 Combinatorics