[seqfan] Re: naive sequence generator
Robert Munafo
mrob27 at gmail.com
Tue Jan 12 21:10:30 CET 2010
I tried putting in one of your "less ugly sequence" formulas, but couldn't
get it to actually recompute the sequence based on the new formula. Is
"sigma" A000203?
On Tue, Jan 12, 2010 at 10:47, Georgi Guninski <guninski at guninski.com>wrote:
> wrote a naive integer sequence generator (basically an expression
> generator).
>
> online demo supporting OEIS searches is at:
> http://stefan.guninski.com/funfu.cgi
>
> the python source (better run it in sage) is at:
> http://stefan.guninski.com/funfu.py
>
> some of the less ugly sequences:
>
> f[0]=1,f[n]= (f[n-1]+Sigma[f[n//2]])
> f[0]=1,f[n]= eulerphi[(Sigma[eulerphi[(n + 1)]]*eulerphi[Sigma[n]])]
> f[0]=1,f[n]= (f[n//2]+f[n//2])
> f[0]=1,f[n]= Sigma[Sigma[eulerphi[eulerphi[(n + 1)]]]]
> f[0]=1,f[n]= (eulerphi[((n+(n + 1))*f[n//2])] // f[n-1])
> ( a // b <=> floor(a/b)
> mass generating sequences and searching in local copy of OEIS didn't
> produce anything reasonable for the limited time i tested.
>
--
Robert Munafo -- mrob.com
More information about the SeqFan
mailing list