Feb 27
IMO Shortlist 2011, Combinatorics 4
#ArithmeticSequence #Combinatorics #IMOShortlist #AdditiveCombinatorics
1
9
240
Jan 14
3
148
27 Dec 2025
Irrational number alpha, beta s.t. [n beta]\in [n alpha]
#Search #FloorFunction #ArithmeticSequence #NumberTheoryProposed #NumberTheory
5
128
14 Dec 2025
1
1
6
433
8 Dec 2025
n^m-1 is not a perfect power for any m in a arithmetic sequence
#ArithmeticSequence #NumberTheory
1
5
314
7 Sep 2025
2
9
245
4 Aug 2025
Expression independent of i,j,k or the arithmetic sequence
#Invariant #ArithmeticSequence #AlgebraUnsolved #Algebra
1
5
269
2 Apr 2025
1
2
6
224
21 Mar 2025
n>=2, a_i are natural numbers; and an arithmetic progression
#NumberTheory #LeastCommonMultiple #ArithmeticSequence #NumberTheoryUnsolved
1
2
112
21 Mar 2025
2
4
277
15 Mar 2025
Strings of T and S
#Symmetry #PigeonholePrinciple #ArithmeticSequence #Algebra #Sequences #AdditiveCombinatorics
2
5
166
14 Mar 2025
A magician has one hundred cards numbered 1 to 100
#Function #ArithmeticSequence #Combinatorics #SetPartition #IMO #IMOShortlist #Hi
2
2
101
6 Mar 2025
Existence of a rational arithmetic sequence
#ArithmeticSequence #NumberTheory #RelativelyPrime #NumberTheoryUnsolved #Hi
1
4
180
2 Mar 2025
2
122
24 Dec 2024
f(m), f(n) are relatively prime whenever (m,n)=1
#Function #ModularArithmetic #Induction #NumberTheory #GreatestCommonDivisor #RelativelyPrime #ArithmeticSequence
1
4
168
7 Sep 2024
1
5
66
7 Jun 2024
A magician has one hundred cards numbered 1 to 100
#Function #SetPartition #ArithmeticSequence #IMO #Combinatorics #Imo2000 #IMOShortlist
2
34
3 Jun 2024
1
3
62