Nonsquares mod 30.

Terms

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