Begins with (4, 5); avoids 3-term arithmetic progressions.

Terms

a(0) =4a(1) =5a(2) =7a(3) =8a(4) =13a(5) =14a(6) =16a(7) =17a(8) =31a(9) =32a(10) =34a(11) =35a(12) =40a(13) =41a(14) =43a(15) =44a(16) =85a(17) =86a(18) =88a(19) =89a(20) =94a(21) =95a(22) =97a(23) =98a(24) =112a(25) =113a(26) =115a(27) =116a(28) =121a(29) =122