Iterated sum-of-digits of n-th prime; or digital root of n-th prime; or n-th prime modulo 9.

Terms

a(0) =2a(1) =3a(2) =5a(3) =7a(4) =2a(5) =4a(6) =8a(7) =1a(8) =5a(9) =2a(10) =4a(11) =1a(12) =5a(13) =7a(14) =2a(15) =8a(16) =5a(17) =7a(18) =4a(19) =8a(20) =1a(21) =7a(22) =2a(23) =8a(24) =7a(25) =2a(26) =4a(27) =8a(28) =1a(29) =5