This video is part of the MegaFavNumbers project. Maths YouTubers have come together to make videos about their favourite numbers bigger than one million, which we are calling #MegaFavNumbers.

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Submit your videos anytime before Wednesday 2nd September to be added to the MegaFavNumbers playlist!

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Amicable Numbers on Wikipedia:
https://en.wikipedia.org/wiki/Amicabl...

Here is a list of amicable numbers:
http://www.vaxasoftware.com/doc_eduen...

A list of sums of amicable numbers
https://oeis.org/A180164

Remember, a test for divisibility by 9 is to add all the digits of the number together, and to do the same with the result, until you get a single digit. If the end result is 9 then the original number was a multiple of 9.

Here is a list of even amicable numbers whose sum is not divisible by 9 https://oeis.org/A291550

And here are those complicated mathematical conditions
https://www.ams.org/journals/mcom/196...