Numbers n such that the arithmetic derivative of the totient(n) is equal to the cototient(n).

Terms

a(0) =1a(1) =3a(2) =8a(3) =20a(4) =28a(5) =44a(6) =48a(7) =92a(8) =188a(9) =228a(10) =236a(11) =324a(12) =332a(13) =428a(14) =668a(15) =716a(16) =756a(17) =908a(18) =1052a(19) =1388a(20) =1436a(21) =1532a(22) =1868a(23) =1916a(24) =2012a(25) =2252a(26) =2348a(27) =2876a(28) =3356a(29) =3452