Replace n with concatenation of its nontrivial odd divisors.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =3a(6) =0a(7) =0a(8) =3a(9) =5a(10) =0a(11) =3a(12) =0a(13) =7a(14) =35a(15) =0a(16) =0a(17) =39a(18) =0a(19) =5a(20) =37a(21) =11a(22) =0a(23) =3a(24) =5a(25) =13a(26) =39a(27) =7a(28) =0a(29) =3515