First differences of A035421.

Terms

a(0) =2a(1) =2a(2) =3a(3) =5a(4) =7a(5) =2a(6) =9a(7) =2a(8) =13a(9) =2a(10) =2a(11) =18a(12) =2a(13) =2a(14) =26a(15) =2a(16) =2a(17) =3a(18) =35a(19) =2a(20) =2a(21) =3a(22) =49a(23) =2a(24) =2a(25) =3a(26) =5a(27) =9a(28) =56a(29) =2