May 3
IMO Shortlist 2013, Combinatorics #5
#Function #Combinatorics #AdditiveCombinatorics #Sequence #IMOShortlist
1
11
452
Apr 2
T contains at least k(n-k) 1 distinct elements
#Combinatorics #IMOShortlist #AdditiveCombinatorics #AdditiveNumberTheory
1
4
93
Feb 27
IMO Shortlist 2011, Combinatorics 4
#ArithmeticSequence #Combinatorics #IMOShortlist #AdditiveCombinatorics
1
9
240
Feb 26
A integer can be written as the sum of 1990 integers
#NumberTheory #AdditiveCombinatorics #AdditiveNumberTheory #Counting #IMOShortlist
1
1
7
208
Jan 8
Sum of integers of the same colour has the same colour again
#Combinatorics #Colouring #Sum #AdditiveCombinatorics
4
160
14 Sep 2025
Number of ideal subsets, n p and n q belong to S
#ModularArithmetic #NumberTheory #Combinatorics #AdditiveNumberTheory #AdditiveCombinatorics #IMOShortlist #Frobenius
7
253
7 May 2025
IMO ShortList 1999, combinatorics problem 4
#ModularArithmetic #Combinatorics #Counting #AdditiveCombinatorics #AdditiveNumberTheory #IMOShortlist #Hi
1
3
159
15 Mar 2025
Strings of T and S
#Symmetry #PigeonholePrinciple #ArithmeticSequence #Algebra #Sequences #AdditiveCombinatorics
2
5
166
17 Feb 2025
A constant a such that f(x) is at most ax for all x
#Function #AlgebraProposed #Algebra #Combinatorics #CombinatoricsProposed #AdditiveCombinatorics
2
94
14 Jan 2025
IMO ShortList 1998, number theory problem 8
#NumberTheory #IntegerSequence #AdditiveCombinatorics #AdditiveNumberTheory #IMOShortlist
1
3
135
11 Nov 2024
2
7
175
6 Oct 2024
5
95
15 Sep 2024
IMO Shortlist 2014 N1
#IMOShortlist #NumberTheory #Frobenius #AdditiveCombinatorics #AdditiveNumberTheory #AdditiveRepresentation #Induction
1
2
9
237
8 Sep 2024
1
2
68
14 Jun 2024
3
38