[seqfan] Re: Shouldn't A158624 be hard and base?

[Charles Greathouse]

I don't understand the sequence.  5^2 = 1 mod 8, so 5^n ends in ...625
if n is even and ...125 if n is odd (for n > 2).  So it doesn't
stabilize to the indicated value (or any value!).

Charles Greathouse
Analyst/Programmer
Case Western Reserve University

On Sun, Apr 1, 2012 at 7:42 PM, Alonso Del Arte
<alonso.delarte at gmail.com> wrote:
> A158624 is the upper limit of the "backward" value of 5^n. I'm thinking
> this should have keyword:base because its value depends on base 10 (in
> quintal it would of course just be 1/5), and keyword:hard because there is
> no known formula.
>
> Al
>
> P.S. I have chosen this for Sequence of the Day for November
> 12<http://oeis.org/wiki/Template:Sequence_of_the_Day_for_November_12>
> .
>
> _______________________________________________
>
> Seqfan Mailing list - http://list.seqfan.eu/