MathForces: Math Olympiads
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D Flags 200 69 Web-Search
2020 digit 200 403 Algebra, Digits
Half Integers 500 2 Combinatorics, Geometry
Oh-matrix 300 121 Algebra, Linear-Algebra, Matrices
Cubical squares 100 494 Algebra, Exponents
Test 100 618
Fractions 300 74 Algebra
Sum of four 100 314 Combinatorics, Digits
Viet said 500 91 Number-Theory
Special square 500 51 Number-Theory, Squares
Numbers ratio 100 515 Algebra, Arithmetics
Product of differences 300 86 Algebra, Inequalities
Ordered papers 300 26 Combinatorics
Divisible sets 300 4 Combinatorics
Triangle in hyperbola 400 59 Algebra, Geometry, Coordinates
Positive product of sums 300 58 Algebra, Equations, Number-Theory
Convex triangle 400 37 Geometry, Combinatorics
Zeros and Ones 300 17 Combinatorics
Integer sequence 400 6 Algebra, Sequences
Powers of 6 500 36 Number-theory, Equations
Relatively prime with 2020 200 191 Number-Theory, Prime-Numbers
Squared fours 200 157 Number-Theory, Algebra
Divisibility by 4 200 177 Number-Theory, Digits
C Sum 300 95 Algebra, Combinatorics, Formulas
2020 Palindromes 100 291 Combinatorics, Palindromes
Odd divisors 300 76 Number-Theory, Divisors
Quadratic Sets 400 4 Combinatorics, Sets, Algebra
Diameter 400 50 Geometry, Perpendiculars
Polynomial without 4 400 40 Algebra, Polynomials
Tricky sequence 500 28 Number-Theory, Algebra, Sequences
Friendly rooks 200 135 Combinatorics, Chess
All such 400 58 Number-Theory, Equations
Similar polynomials 500 47 Algebra, Polynomials
x[x] 400 46 Number-Theory, Floor-Function
Weird equation 200 181 Algebra, Polynomials
First geometry 400 55 Geometry, Circles, Tangents
Tricky polynomial 600 41 Algebra, Polynomials, Complex-Numbers
Area of triangle 200 173 Geometry, Squares, Areas
Many digits 400 94 Algebra
335577 500 32 Number-Theory, Powers
Independence 300 10 Combinatorics, Probabilities
Rooks 600 14 Combinatorics
One three-digit number 200 227 Algebra, Inequalities
Friends Playing 600 16 Combinatorics
Sum of digits 2020 200 133 Number-Theory, Digits
Progressive sequence 500 18 Algebra, Number-Theory, Sequences
Angle chasing 300 122 Geometry, Angle-Chasing
Lin's Numbers 400 28 Number-Theory, Algebra
Hexagonial 300 8 Geometry, Hexagons
Lin the Racoon's Debut 600 16 Combinatorics, Raccoon
What a function 400 37 Algebra, Functions
Tricky 400 59 Number-Theory
Almost squared numbers 300 40 Number-Theory
Concetric 200 49 Geometry
Odd factors 500 26
Excirlce 400 2 Geometry
School Clubs 500 3 Combinatorics
Also palindrome 400 41 Digits
Reverse Product 400 33 Combinatorics, Number-Theory
Just sequence 300 136 Algebra, Sequences
Function 300 183 Algebra, Functional-Equations
Prime powers 400 37
Air MF 500 5 Combinatorics
Minimizing Fibb 400 112 Algebra, Sequences
Inverse Sum in Triangle 500 10 Geometry
Tommorow's day 100 579 Algebra, Digits
Tan-Sin 500 37 Geometry, Trigonometry
Exactly two roots 400 43 Number-Theory, Equations
NRD pair 200 85 Number-Theory, Prime-Numbers
Sqaure in square 600 35 Geometry, Squares
Orthocenter 600 12 Geometry, Circles, Tangents
Functional Eq 700 15 Algebra, Functional-Equations
Revolution 300 16 Combinatorics
Square multiples of 24 200 205
Simple expression 300 75 Algebra, Combinatorics
Zero sequence 200 63 Algebra, Sequences
6 Apart 500 85 Geometry, 3D
Arithmetic derivative 500 39 Number-Theory, Functions
Unfair Game 400 29 Combinatorics
U turn 200 139 Algebra, Number-Theory, Digits
Fancy meal 300 71
VNT 500 96 Number-Theory, LTE
Circled 700 12 Geometry, Combinatorics
Interesting functions 600 12 Number-Theory
MTMTK System 400 19 Algebra, Equations
Irreducible Fractions 200 49 Number-Theory
Switchers 400 42 Combinatorics, Sets
Sequenta 300 60 Algebra, Sequences
Fancy point 500 11 Geometry
New FE 300 47 Functional-Equations
More dominos 400 28 Combinatorics
Simple sum 300 26 Algebra, Sums
Gineq 300 45 Geometry
Money date 100 266 Combinatorics, Probabilities
Concatenate 500 14 Number-Theory
Equilateral Triangles 200 194 Combinatorics, Grids
Good Order 600 3 Algebra, Number-Theory
Random answer 100 387 Random
2+1 200 217 Algebra, Arithmetics
Cool-divisble numbers 300 62 Number-Theory, Digits
Rational Irrational 300 28 Algebra, Number-Theory
Random numbers 400 14 Algebra, Combinatorics
Semiperimeter 200 34 Geometry
Mathrix 600 2 Algebra, Number-Theory, Matrices
Soccer Game 500 9 Combinatorics
Half of Octahedron 400 123 Combinatorics, Graphs
Powered Numbers (Duplicate) 300 49 Algebra, Number-Theory
Friendly Team 400 10 Combinatorics
Prime Sets 500 8 Combinatorics, Number-Theory
Sum of Digits 200 56 Number-Theory, Digits
Digital Cubes 100 55 Algebra, Digits
Small triangular numbers 200 123 Algebra, Number-Theory
ADAD (Duplicate) 400 39 Geometry, Circles
MathForces Store 500 32 Combinatorics
Max Area 300 33 Geometry
Expanding brackets 300 139 Algebra, Polynomials
Lucky numbers 100 101 Digits, Algebra
Simple Altai 400 17 Number-Theory
Chords 300 9 Geometry, Circles
New Cake 400 25 Geometry
Math lesson 400 39 Number-Theory, Combinatorics
Parking 300 178 Combinatorics
Point O 400 95 Geometry
5th power equation 500 59 Algebra, Equations
Obtuser 400 18 Combinatorics, Geometry
Hold me 500 17 Algebra
ADAD 400 37 Geometry, Circles
Sequence 300 41 Number-Theory
Almost fixed 400 10 Combinatorics, Algebra
Subsets Collection 600 24 Combinatorics, Sets
Sum of Squares 500 24 Geometry
Cuboid 300 26 Number-Theory
Equiangular Hexagon 400 10
Flip 200 56 Algebra, Number-Theory, Digits
Love Triangle 400 4 Combinatorics
Four on a circle 400 43 Geometry, Circles
Maximum of Minimum 500 25 Algebra, Inequalities
Polynomial Probability 600 26
Rational Polynomial 400 24 Algebra, Polynomials
Checkboard 600 3 Combinatorics
Base4 300 28 Number-Theory
Powered Numbers 300 50 Algebra, Number-Theory
Administrative function 900 9
Not your business 200 179 Geometry, Tangents
0,1,2 polynomial 400 20 Combinatorics, Algebra
Lin Jumper 500 14 Combinatorics
Smallest number 600 240 Algebra
Odd polynomial 400 101 Algebra, Polynomials
Permutational Polynomial 500 30 Algebra
Smallest degree 400 5 Algebra, Polynomials
Not fibbo 300 46 Algebra, Sequences
!Fancy FE 500 9 Algebra, Polynomials
Temirlan's cake 100 655 Algebra, Arithmetics
Fill the square 400 16 Combinatorics, Algebra
Rotating Hexagon 600 2 Geometry, Combinatorics
Sum probability 300 72 Combinatorics, Algebra, Probablilities
Lin does shopping 200 23 Algebra, Number-Theory
5 instead of 1 200 169
Just Easy Sum 100 86 Algebra
!Fancy cubic 300 64 Algebra, Number-Theory
Discriminant 400 29 Algebra, Polynomials
Factorial Factor 200 48 Number-Theory, Combinatorics
6-sums 100 71 Algebra
Triangle and Square 200 46 Geometry
Weird games 500 20 Combinatorics
Cyclic Q 600 13 Geometry
Binary Sum 500 22 Number-Theory, Algebra
Again these rooks 600 55 Combinatorics, Boards
Bingo! 200 124 Combinatorics, Probabilities
Sharp inequality 500 9 Algebra, Inequalities
Triangle in Hexagon 200 45 Geometry, Probabilities
Cemicirlces 300 11 Geometry, Areas
Cube Cube Square 300 24 Algebra, Number-Theory
Big set 400 15 Combinatorics
Five Primes 100 81 Number-Theory
Negative roots 300 21 Algebra
Solutions on the interval 300 53 Algebra, Equations
Not constant 300 22 Algebra, Number-Theory
Regular Polygons 200 44 Geometry, Combinatorics
Daniyar's Friends 300 27
Pencils 400 7 Combinatorics
Poly 600 9 Algebra
!Fancy grid 700 8 Combinatorics, Graphs
Where is my husband 500 23 Combinatorics, True-False
Infinite game 500 38 Combinatorics, Games
Quadratic 300 40 Algebra, Number-Theory
!Fancy polygon 400 38 Geometry, 3D
Lin's Octagon 300 39 Combinatorics
Cyclic Areas 300 20 Geometry, Areas
!Fancy sequence 600 8 Combinatorics, Number-Theory
Nice polynomial 700 7 Algebra
Pentagon 500 17 Geometry, Combinatorics, Pentagons
Product of areas 300 38 Geometry
Monochromatics 400 5 Combinatorics, Graphs
Total inversion 500 31 Combinatorics, Geometry
Fancy limit 400 31 Algebra, Sequences
Lin's Game 400 9 Combinatorics, Games
Small triangle 600 13 Geometry, Areas
Nice Integer 400 5 Number-Theory, Algebra, Polynomials
Number Coloring 400 21 Combinatorics
Novirus 300 78 Combinatorics, Graphs
Too much 600 25 Algebra, Equations
Sharingan 500 10 Geometry
Fancy integral 700 30 Algebra, Sums, Integrals
Seven eleven 200 42 Algebra
Bools and cows 200 146 Random, Combinatorics
Fancy polynomial 800 20 Algebra, Polynomials
Flights 500 9 Combinatorics, Graphs