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aiSee: Divisibility Graph
This graph can be used to quickly calculate whether a given number is divisible by 7.
- Start at the circle node at the top.
- For each digit d in the given number, follow d blue (solid) edges in succession. As you move from one digit to the next, follow 1 red (dashed) edge.
- If you end up back at the circle node, your number is divisible by 7.
For example, if the given number is 3703, follow 3 blue edges, then 1 red edge, then 7 blue edges, then 2 red edges, and finally 3 blue edges.