[seqfan] Re: b-file mismatch A050801

Harry J. Smith hjsmithh at sbcglobal.net
Mon Jan 12 23:47:57 CET 2009


I'm generating a good b-file for this but it only has 412 entries so far. I
was using my PARI program


{


  m=1;


  a=0;


  until (0,


    a=a+1;


    a2=a*a;


    b1=((a2/2)^(1/3))\1;


    for (b=b1, a,


      b3=b*b*b;


      c1=1;


      if (a2 > b3, c1=((a2-b3)^(1/3))\1;);


      for (c=c1, b,


        d=b3 + c*c*c;


        if (d > a2 && c == 1, break(2));


        if (d > a2, break);


        if (a2 == d,


          print(m, " ", a); write("b050801.txt", m, " ", a); m=m+1;
break(2);


        );


      )


    )


  )


}


Maybe this could be improved upon. I will attach the b-file I have with
n=1,.,412


[seqfan] b-file mismatch A050801


Richard Mathar mathar at strw.leidenuniv.nl
<mailto:seqfan%40list.seqfan.eu?Subject=%5Bseqfan%5D%20%20b-file%20mismatch%
20A050801&In-Reply-To=> 
Fri Jan 9 16:43:18 CET 2009 

  _____  

The b-file
http://www.research.att.com/~njas/sequences/b050801.txt
is in obvious discrepancy with the main database entry, first at
a(3). It probably shows values of n "with repetition" of some kind.
 
I propose someone submits a b-file which is consistent with the
main entry, listing solutions "n" sorted and uniq'ed.
 
http://research.att.com/~njas/sequences/A050801
 
Richard J. Mathar

 

 

 

-Harry

 

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