Co-defined sequence

[Jon Perry]

A001047 

is also defined by:

3(a_i-1)+2^i

This has relevance to the Collatz function, see:

http://www.users.globalnet.co.uk/~perry/maths/collatz/collatz.htm

Jon Perry
perry at globalnet.co.uk
http://www.users.globalnet.co.uk/~perry/maths
BrainBench MVP for HTML and JavaScript
http://www.brainbench.com
 

-----Original Message-----
From: Antti Karttunen [mailto:karttu at megabaud.fi]
Sent: 22 August 2002 21:39
To: seqfan at ext.jussieu.fr
Cc: njas at research.att.com
Subject: Re: Guinness Book of Records??




"N. J. A. Sloane" wrote:
> 
> Dear Seqfans,
> Amarnath Murthy suggested the the On-Line Encyclopedia
> of Integer Sequences might be worthy of inclusion in
> the Guinness Book of Records.  Would someone be
> willing to volunteer to suggest it to them?

On what subject OEIS would be a record holder?
We can find several, but a field were there are
at least some competition, but nothing serious
for a long time, might be good?

I mean, "The database with the largest number of integer sequences"
is almost a tautology...

The database with most ???
(not the number of "entries", surely, but, say, the amount
of new material arriving per day, from volunteers?)
Or ???


Would "The database with largest number of mathematical formulae"
win?


> 
> I looked at their website,
> http://www.guinnessrecords.com/
> which is a fine example of what you can do with Javascript, by the way

Sorry, but I think the site uses a Macromedia plug-in to achieve
the effects, and Javascript-part seems to contain only
the definitions:

var baseURL = "http://www.guinnessworldrecords.com/"
var formsbaseurl = "/enquiries/"
var trumpsbaseurl = "http://trumps.guinnessworldrecords.com/"

(Just my warning: JavaScript is a major pain in the a** to get
it to work with different browsers, if you consider any "upgrade"
of OEIS towards that direction. Or at least it was in 1998 when I had to
last touch it.)

> 
> NJAS


-- Antti