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David G. Stork
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I really like the Collatz conjecture graph ($3n+1$ problem), the graph showing the evolution of natural numbers under the rule: If $x$ is even, divide by 2; if $x$ is odd, multiply by 3 and add 1. Here's the graph with $100,000$ nodes:

Collatz graph

David G. Stork
  • 2.6k
  • 1
  • 21
  • 37