Numbers n such that sigma(n) = phi(n) + phi(n-1) + phi(n-2).

Terms

a(0) =3a(1) =82a(2) =1898a(3) =2457a(4) =4294a(5) =4526a(6) =4748a(7) =8494a(8) =14798a(9) =15566a(10) =16095a(11) =34988a(12) =97402a(13) =883082a(14) =1015658a(15) =1121686a(16) =2699445a(17) =3090945a(18) =3714454a(19) =5668598a(20) =10376835a(21) =13032398a(22) =32290154a(23) =40250422a(24) =123960795a(25) =150301604a(26) =157673985a(27) =165102854a(28) =167691466a(29) =235444618