a(1)=1, a(n+1) = prime(a(n)+1) - a(n).

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =7a(5) =12a(6) =29a(7) =84a(8) =355a(9) =2038a(10) =15723a(11) =156920a(12) =1959177a(13) =29788564a(14) =539206155a(15) =11406258536a(16) =277708694711