a(1) = 1, a(n) = a(n-1) + phi(a(n-1)).

Terms

a(0) =1a(1) =2a(2) =3a(3) =5a(4) =9a(5) =15a(6) =23a(7) =45a(8) =69a(9) =113a(10) =225a(11) =345a(12) =521a(13) =1041a(14) =1733a(15) =3465a(16) =4905a(17) =7497a(18) =11529a(19) =18009a(20) =29097a(21) =47817a(22) =71577a(23) =114777a(24) =184761a(25) =307881a(26) =482841a(27) =804573a(28) =1212813a(29) =1854333