Numbers k such that sigma(k-phi(k)) = phi(k).

Terms

a(0) =2a(1) =15a(2) =39a(3) =255a(4) =627a(5) =939a(6) =1431a(7) =1581a(8) =2409a(9) =3459a(10) =4797a(11) =14289a(12) =20619a(13) =30987a(14) =31935a(15) =43791a(16) =57291a(17) =68991a(18) =71193a(19) =73749a(20) =74841a(21) =94671a(22) =120669a(23) =121227a(24) =132297a(25) =148161a(26) =162843a(27) =196449a(28) =200787a(29) =209451