Euler-phi of these numbers is a decimal repdigit.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =9a(9) =10a(10) =12a(11) =14a(12) =15a(13) =16a(14) =18a(15) =20a(16) =23a(17) =24a(18) =30a(19) =46a(20) =67a(21) =69a(22) =89a(23) =92a(24) =115a(25) =134a(26) =138a(27) =178a(28) =184a(29) =223