Graph divisibility problem
119543
Counting edges in a specially defined graph
142861
Multipartite graphs which are not planar
38700
the Nordhaus-Gaddum problems for chromatic number of graph and its complement
117349
counting triangles in a graph or its complement
49045
Graph theory: Tree holds two sub-tree with an amount of vertices
102539
Min. number of vertices in graph as function of $\kappa(G)$ and $\operatorname{diam}(G)$
153892
Number Theory divisibilty
107964
Simple combinatorics problem.
28877
Graph with $k$ components.
27373
Graph Proof by induction.
71625
Divisibility question
83036
f(g(x)) has a degree divisible by n
151152
Removing nodes from graphs such that one is dependent on other - ZIO $2010$, P$1$
51002
Regular graph (Homework)
138465
Graph Coloring and Complete Graph
76104
Bipartite graph. average degree. Euler circuit.
83872
Isomorphisms for graphs with loops and multiple edges