Number of integer triangles.
67774
Number of isosceles triangle.
23916
Does 3-partite graph with at least n+1 edges per vertex have a triangle?
93459
Number of permutations of unspecified length
142144
Countable or uncountable; family of disjoint triangles?
110723
Catalan numbers and triangulation
78407
Are there infinitely-many numbers that are both square and triangular?
81975
Sequence of triangles with exponentiated sides
130751
Lower bound for monochromatic triangles in $K_n$
134352
The number of possible factorizations of a positive integer.
68882
Path to Combinatorics Problem [$1.11$]
50550
Combinatorics Distribution - Number of integer solutions Concept Explanation
61268
Is there a combinatorial interpretation of the triangular numbers?
65372
Triangles defined on an infinite Go board by same-colored stones
99202
What is the number of triangles with integer sides, given the length of the longest side?
140416
Catalan number - combinatoric
100832
Number of binary trees with $N$ nodes
45027
number of primitive Pythagorean triangles whose hypotenuses do not exceed n?