a(n) = 3^n mod 31.

Terms

a(0) =1a(1) =3a(2) =9a(3) =27a(4) =19a(5) =26a(6) =16a(7) =17a(8) =20a(9) =29a(10) =25a(11) =13a(12) =8a(13) =24a(14) =10a(15) =30a(16) =28a(17) =22a(18) =4a(19) =12a(20) =5a(21) =15a(22) =14a(23) =11a(24) =2a(25) =6a(26) =18a(27) =23a(28) =7a(29) =21