Period 2: repeat (3,7).

Terms

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