A064539 All...are divisible by 3 but why?

[Robert G. Wilson v]

Et al,

	I concur.

Bob.

Pfoertner, Hugo wrote:

> -----Original Message-----
> From: zak seidov [mailto:zakseidov at yahoo.com] 
> Sent: Friday, June 24, 2005 09:25
> To: Simon Nickerson; seqfan at ext.jussieu.fr; davidwwilson at comcast.net
> Subject: Re: A064539 All...are divisible by 3 but why?
> 
> [...]
> 
> .... i submitted A109216, 
> 
> %S A109216 
> 3,17,3,3,593,3,3,32993,3,3,2097593,3,3,73,3,3,8589935681,3,3,17,3,3,11,3,3,8
> 3,3,3,11,3,3,17,3,3,857,3,3,71329,3,3,59,3,3,19,3,3,11,3,3,17
> %N A109216 Smallest factor of 2^(2n+1)+(2n+1)^2.
> [...]
> %O A109216 0
> %K A109216 ,base,nice,nonn,
> %A A109216 Zak Seidov (zakseidov at yahoo.com), Jun 24
> 2005
> 
> --------
> 
> Recently we had a discussion on the use of the "base" keyword. In my opinion
> the sequence above is an example where "base" is totally inappropriate,
> because the result has nothing to do with the respresentation of the numbers
> in a certain base-x system.
> 
> Hugo
>