login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A211429 Number of ordered triples (w,x,y) with all terms in {-n,...,0,...,n} and w^3 + x*y = 0. 2

%I #9 Nov 22 2016 02:38:47

%S 1,9,13,17,29,33,37,41,57,69,73,77,81,85,89,93,105,109,121,125,129,

%T 133,137,141,153,165,169,193,197,201,205,209,229,233,237,241,253,257,

%U 261,265,277,281,285,289,293,297,301,305,317,329,341,345,349,353

%N Number of ordered triples (w,x,y) with all terms in {-n,...,0,...,n} and w^3 + x*y = 0.

%C For a guide to related sequences, see A211422.

%H Chai Wah Wu, <a href="/A211429/b211429.txt">Table of n, a(n) for n = 0..10000</a>

%t t[n_] := t[n] = Flatten[Table[w^3 + x*y, {w, -n, n}, {x, -n, n}, {y, -n, n}]]

%t c[n_] := Count[t[n], 0]

%t t = Table[c[n], {n, 0, 70}] (* A211429 *)

%t (t - 1)/4 (* integers *)

%Y Cf. A211422.

%K nonn

%O 0,2

%A _Clark Kimberling_, Apr 10 2012

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 2 16:11 EDT 2024. Contains 374848 sequences. (Running on oeis4.)