Begins with (3, 4); avoids 3-term arithmetic progressions.

Terms

a(0) =3a(1) =4a(2) =6a(3) =7a(4) =12a(5) =13a(6) =15a(7) =16a(8) =30a(9) =31a(10) =33a(11) =34a(12) =39a(13) =40a(14) =42a(15) =43a(16) =84a(17) =85a(18) =87a(19) =88a(20) =93a(21) =94a(22) =96a(23) =97a(24) =111a(25) =112a(26) =114a(27) =115a(28) =120a(29) =121