Numbers n such that (phi(n) + sigma(n))/(rad(n))^2 is an integer > 1 (phi=A000010, sigma=A000203, rad=A007947).

A097982

Numbers n such that (phi(n) + sigma(n))/(rad(n))^2 is an integer > 1 (phi=A000010, sigma=A000203, rad=A007947).

Terms

    a(0) =1a(1) =864a(2) =2430a(3) =7776a(4) =27000a(5) =55296a(6) =69984a(7) =82134a(8) =215622a(9) =432000a(10) =497664a(11) =629856a(12) =675000a(13) =862488a(14) =1499136a(15) =1749600a(16) =2187000a(17) =2667168a(18) =3449952a(19) =3538944a(20) =4287500a(21) =4312440a(22) =4478976a(23) =4563000a(24) =5668704a(25) =6912000a(26) =10800000a(27) =13045131a(28) =13799808a(29) =16875000

External references