Number of solutions to n^2 < x^2 + y^2 + z^2 < (n+1)^2; number of lattice points between spheres of radii n and n+1.

A078184

Number of solutions to n^2 < x^2 + y^2 + z^2 < (n+1)^2; number of lattice points between spheres of radii n and n+1.

Terms

    a(0) =0a(1) =20a(2) =60a(3) =128a(4) =228a(5) =380a(6) =440a(7) =684a(8) =860a(9) =1068a(10) =1328a(11) =1548a(12) =1940a(13) =2288a(14) =2484a(15) =2924a(16) =3300a(17) =3824a(18) =4140a(19) =4700a(20) =5240a(21) =5484a(22) =6260a(23) =6864a(24) =7340a(25) =8180a(26) =8676a(27) =9392a(28) =9804a(29) =10988

External references