# What's the graph relation? #1

What is the relation that connects the nodes of this digraph?

• I think there is a typo in the question. It shouldn't be "diagraph" right?
– H_D
Apr 29 '20 at 2:05
• Thanks for checking up on my spelling. "Digraph" is actually what I intended. It is an abbreviation of "directed graph". Apr 29 '20 at 2:07
• Oh okok sorry I didn't know that abbreviation.
– H_D
Apr 29 '20 at 2:09
• No problem at all. Every discipline has its own jargon that confuses everyone else :P Apr 29 '20 at 2:10

Node $$i$$ goes to node $$i+s(i)$$, where $$s(i)$$ is the sum of the proper divisors of $$i$$