[seqfan] Re: Xmas-challenge

[Michael Branicky]

Got wind of this thread from seeing some OEIS sequence edits and then
joined seqfan ...

Below is a link to a write-up I did a few years ago based on seeing the 538
Riddler problem for 1..100.

It also includes my attempt at their extra credit challenge for the divisor
graph for the numbers 1..1000, with length 641.

https://colab.research.google.com/drive/1XOup6bJ6yHL-gElDjSCPH1h9ozsVuk_g#forceEdit=true&offline=true&sandboxMode=true

- Michael S. Branicky