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!)
A211483 Number of ordered triples (w,x,y) with all terms in {-n,...,0,...,n} and (w+n)^2=x+y. 2

%I #4 Apr 18 2012 17:06:12

%S 1,5,10,16,22,30,38,46,55,65,75,85,95,107,119,131,143,155,168,182,196,

%T 210,224,238,252,268,284,300,316,332,348,364,381,399,417,435,453,471,

%U 489,507,525,545,565,585,605,625,645,665,685,705,726,748,770

%N Number of ordered triples (w,x,y) with all terms in {-n,...,0,...,n} and (w+n)^2=x+y.

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

%t t[n_] := t[n] = Flatten[Table[(n + w)^2 - 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}] (* A211483 *)

%Y Cf. A211422.

%K nonn

%O 0,2

%A _Clark Kimberling_, Apr 12 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 14 03:09 EDT 2024. Contains 375146 sequences. (Running on oeis4.)