a(n) = p - A072181(n), where p is the least prime > A072181(n) + 1.

Terms

a(0) =2a(1) =3a(2) =5a(3) =5a(4) =7a(5) =7a(6) =11a(7) =13a(8) =13a(9) =13a(10) =13a(11) =13a(12) =17a(13) =17a(14) =17a(15) =23a(16) =59a(17) =47a(18) =41a(19) =23a(20) =23a(21) =23a(22) =83a(23) =293a(24) =383a(25) =383a(26) =103a(27) =563a(28) =107a(29) =107