Replace 2n+1 with concatenation of its divisors.

Terms

a(0) =1a(1) =13a(2) =15a(3) =17a(4) =139a(5) =111a(6) =113a(7) =13515a(8) =117a(9) =119a(10) =13721a(11) =123a(12) =1525a(13) =13927a(14) =129a(15) =131a(16) =131133a(17) =15735a(18) =137a(19) =131339a(20) =141a(21) =143a(22) =13591545a(23) =147a(24) =1749a(25) =131751a(26) =153a(27) =151155a(28) =131957a(29) =159