[seqfan] Re: Proof of the A186080 conjecture

Max Alekseyev maxale at gmail.com
Sun Mar 6 23:22:59 CET 2011

The proof is flawed.
In particular, the conclusion "therefore   n^4 = C^4" is not justified.
First, n^4 and C^4 are not necessary single digits.
Second, the decimal representation of (n*10^k + C)^4 does not
necessary starts with n^4 (e.g., 59^4=12117361 does not start with


On Mon, Mar 7, 2011 at 12:07 AM, Matevž Markovič
<matevz.markovic.v at gmail.com> wrote:
> Hy!
> First, I want to say hello to everyone!
> I joined oeis some months ago and in the meantime I developed my first
> conjecture: https://oeis.org/A186080.
> My conjecture states, that every natural number n, which is a palindrome if
> you square it, is of the form 10000...00001.
> I also uploaded the proof, but I do not know if it is correct, can you
> please review it? link: Proof of my
> conjecture<https://oeis.org/A186080/a186080.txt>
> Matevž Markovič
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