A136010 ?

[Eric DESBIAUX]

 what do you mean by non-productive?
the answer at a question must be productive in the context of a question in a quick test made of several other questions?


> Message du 27/03/08 02:20
> De : "Alexander Povolotsky" 
> A : "Eric" 
> Copie à : 
> Objet : Re: A136010 ?
> 
> I think that you may be right that first two terms could be "keys" for
> the rest of the sequence.
> But  your counting vs positioning interpretation is not productive.
> 
> Instead note the fact that 20 in base 9 is equal decimal 18 ....
> 
> On Wed, Mar 26, 2008 at 4:12 PM, Eric  wrote:
> > 20, 9, 243, 1782, 14661, 118665, 962604, 7806213, 63306927, 513404406
> >
> >  at the 20 position i need a 9
> >  so as you say each number could be divide by 9
> >  so to have 9 at position 20....
> >  i do the number - the sum of each term of the number...
> >
> >  like this
> >  1 sum of numbers 1 :o) 1-1=0
> >  etc until 10
> >  after i have 9 until 20
> >
> >  so 243 at 280
> >  1990 for 1782
> >  16300 for 14661...
> >
> >  (i think it will be another one stupid mail from me but it's not a problem
> >  lol :o) )
> >
> >
> >  -----Message d'origine-----
> >  De : Alexander Povolotsky [mailto:apovolot at gmail.com]
> >  Envoyé : mercredi 26 mars 2008 14:37
> >  À : seqfan at ext.jussieu.fr
> >  Objet : A136010 ?
> >
> >
> >
> >
> >   Sorry for bothering everyone ...
> >
> >  But did anyone looked at recently submitted A136010 ?
> >  It looks like a puzzle to me since no verbal definition of the pattern
> >  or mathematical rule of generation is given ...
> >
> >  As far as I could only see is that:
> >
> >  a) The terms starting from the second one are dividable by 9 ...
> >  b) The terms starting from the third one are dividable by 81 ....
> >
> >  Alex
> >  ----------------------------------------------------------------------------
> >  ---------------
> >
> >  A136010  From an online IQ test (Adaptive IQ ). Solution not known to
> >  the submitter.
> >
> >   20, 9, 243, 1782, 14661, 118665, 962604, 7806213, 63306927, 513404406
> >  (list; graph; listen)
> >
> >   OFFSET  1,1
> >
> >   FORMULA  nonn,unkn
> >
> >   EXAMPLE  20=4*5, 4+5=9.
> >
> >  But 9 = 3+6 = 3*3, while 243 = 3^5?
> >
> >  1782=162*11=81*22?
> >
> >  14661=81*181?
> >
> >   KEYWORD  nonn,new
> >
> >   AUTHOR  Jordan Giedd (jordyg365(AT)gmail.com), Mar 20 2008
> >
> >
> >
> 
> 
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