a(1)=2, a(n+1) is the smallest prime with sum of even digits >= sum of even digits of a(n).

Terms

a(0) =2a(1) =23a(2) =29a(3) =41a(4) =43a(5) =47a(6) =61a(7) =67a(8) =83a(9) =89a(10) =181a(11) =263a(12) =269a(13) =281a(14) =283a(15) =461a(16) =463a(17) =467a(18) =487a(19) =661a(20) =683a(21) =863a(22) =881a(23) =883a(24) =887a(25) =1889a(26) =2683a(27) =2687a(28) =2689a(29) =2861