Numbers k such that (k, phi(k), sigma(k)) lies on a sphere with integral radius centered at the origin, i.e., k^2 + phi(k)^2 + sigma(k)^2 is a square.

A066785

Numbers k such that (k, phi(k), sigma(k)) lies on a sphere with integral radius centered at the origin, i.e., k^2 + phi(k)^2 + sigma(k)^2 is a square.

Terms

    a(0) =603a(1) =1414a(2) =1444a(3) =2093a(4) =7434a(5) =12822a(6) =66584a(7) =66960a(8) =91000a(9) =138645a(10) =160130a(11) =167400a(12) =169212a(13) =210476a(14) =218592a(15) =229026a(16) =236572a(17) =265977a(18) =304128a(19) =344790a(20) =493722a(21) =618570a(22) =754110a(23) =950158a(24) =1091385a(25) =1113480a(26) =1760616a(27) =1761409a(28) =2116116a(29) =2733131

External references