Nonsquares mod 39.

Terms

a(0) =2a(1) =5a(2) =6a(3) =7a(4) =8a(5) =11a(6) =14a(7) =15a(8) =17a(9) =18a(10) =19a(11) =20a(12) =21a(13) =23a(14) =24a(15) =26a(16) =28a(17) =29a(18) =31a(19) =32a(20) =33a(21) =34a(22) =35a(23) =37a(24) =38