Talk:Repdigit Triangular Numbers

Sorry for this lousy, fragmented proof.

This is modified from https://sdaos.org/wp-content/uploads/pdfs/Vol%2051%201972/72p52.pdf.

However I am 90% confident this proof is flawed, when I was halfway through rewriting it.

The same authors published a proof in J.R.Math Vol. 8, which I have no access to at the moment.

Neither do I have access to ''Bir Kafle et al., Triangular repblocks, Fib. Q., 56:4 (2018), 325-328''. --RandomUndergrad (talk) 12:45, 17 July 2020 (UTC)


 * I'm not sure how much help the above citation is going to be, because according to the abstract, it only covers $55$ and $66$ and not $666$. I'm toying with the idea of subscribing to FQ at the moment. --prime mover (talk) 13:02, 17 July 2020 (UTC)