The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A073091 Number of ways to express n as (x^3+y^3+z^3)/(x+y+z) 1<=x<=y<=z<=n. 0

%I

%S 1,0,0,1,0,1,0,0,1,1,2,0,0,0,0,2,1,1,1,0,0,0,0,1,2,0,1,0,0,0,2,0,1,2,

%T 0,1,0,1,0,2,0,0,1,2,1,1,0,0,3,0,2,0,0,1,0,0,2,0,0,1,0,0,0,3,0,1,2,1,

%U 2,0,1,1,0,0,0,3,0,0,2,0,2,1,1,0,2,2,0,0,1,1,0,0,0,2,0,1,0,0,3,3

%N Number of ways to express n as (x^3+y^3+z^3)/(x+y+z) 1<=x<=y<=z<=n.

%o (PARI) a(n)=sum(x=1,n,sum(y=1,x,sum(z=1,y,if((x^3+y^3+z^3)/(x+y+z)-n,0,1))))

%K easy,nonn

%O 1,11

%A _Benoit Cloitre_, Aug 18 2002

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

Last modified July 30 06:21 EDT 2021. Contains 346348 sequences. (Running on oeis4.)