Numbers k such that phi(k) + uphi(k) = k, where phi is the Euler totient function (A000010) and uphi is the unitary totient function (A047994).

A329729

Numbers k such that phi(k) + uphi(k) = k, where phi is the Euler totient function (A000010) and uphi is the unitary totient function (A047994).

Terms

    a(0) =2a(1) =20a(2) =36a(3) =440a(4) =1008a(5) =2052a(6) =20240a(7) =86688a(8) =116928a(9) =192024a(10) =354240a(11) =1460160a(12) =1902560a(13) =42451200a(14) =43007328a(15) =77299200a(16) =1595255040a(17) =4556027520a(18) =17973550080a(19) =34221035520a(20) =62863257600a(21) =76146739200a(22) =91506844800a(23) =602152462080

External references