puzzle sequences

[zak seidov]

Dear SeqFans,

Here are two from me:

2,4,8,20,72,360,282,422,80,...
2,3,5,11,31,127,103,5,...

BTW, why in all puzzle sequences,
the number of given terms is so small?

zak



--- Floor en Lyanne van Lamoen <fvanlamoen at planet.nl>
wrote:

> Dear SeqFans,
> 
> Here is another Ask Dr. Math puzzle sequence:
> 
> 5 15 365 945 ...
> 
> I have no clue.
> 
> Kind regards,
> Floor.
> 
> > -----Oorspronkelijk bericht-----
> > Van: Joshua Zucker
> [mailto:joshua.zucker at gmail.com]
> > Verzonden: donderdag 24 november 2005 09:55
> > Aan: Sequence Fans
> > Onderwerp: puzzle sequences
> > 
> > I am a volunteer for Ask Dr Math, so I often get
> puzzle sequences sent
> > in.  Most of them are pretty easy, and I can
> figure them out myself,
> > or the OEIS search/superseeker takes care of them.
> > 
> > But a few stump me and superseeker too.  Sometimes
> typos cause the
> > problems.  Sometimes I just have no idea.  Most of
> them come from high
> > school classrooms.  Maybe some of them don't have
> any pattern and are
> > just practical jokes.
> > 
> > Here's a few that have stumped me lately.  If you
> have any ideas,
> > please let me know so I can help these students
> (and me!) learn
> > something.  As far as I know, none are related to
> each other in any
> > way.
> > 
> > Thanks,
> > --Joshua Zucker aka Dr. Schwa at
> http://mathforum.org/dr.math
> > 
> > 1000, 72, 5, 25, 7  Hint: other patterns from this
> student included 1,
> > 5, 10, 25, 50 (money) and 60, 60, 24, 7, 52 (time,
> though I think that
> > 52 is a bit arguable!  52 1/7?  52 5/28?  or
> something even more
> > exact?  But whatever, call it an integer sequence
> and it's 52 I
> > guess.).
> > 
> > 
> > 
> > 30 28 32 38 40 42 46 52 60 60 64 68
> > 
> > 
> > 
> > 7,8,4,6,25,26,13,15
> 
> 



		
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