Not sure about here, but Chris Thompson posted it to seqfans in December 2016, which is what prompted me to (eventually) make the web page that provoked the numberphile video that you probably just watched! On Wed, 19 Sep 2018, 15:14 Henry Baker, <hbaker1@pipeline.com> wrote:
FYI --
This result may have been discussed here already...
https://arxiv.org/abs/1602.06208v2
Every positive integer is a sum of three palindromes
Javier Cilleruelo, Florian Luca, Lewis Baxter
(Submitted on 19 Feb 2016 (v1), last revised 17 Jun 2017 (this version, v2))
For integer $g\ge 5$, we prove that any positive integer can be written as a sum of three palindromes in base $g$.
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