Prime(A052928(n+1)) + (-1)^n* prime(A109613(n)).

Terms

a(0) =1a(1) =8a(2) =2a(3) =18a(4) =2a(5) =30a(6) =2a(7) =42a(8) =6a(9) =60a(10) =6a(11) =78a(12) =2a(13) =90a(14) =6a(15) =112a(16) =2a(17) =128a(18) =4a(19) =144a(20) =6a(21) =162a(22) =6a(23) =186a(24) =4a(25) =204a(26) =4a(27) =216a(28) =4a(29) =240