Replace n with concatenation of its divisors >1.

Terms

a(0) =0a(1) =2a(2) =3a(3) =24a(4) =5a(5) =236a(6) =7a(7) =248a(8) =39a(9) =2510a(10) =11a(11) =234612a(12) =13a(13) =2714a(14) =3515a(15) =24816a(16) =17a(17) =236918a(18) =19a(19) =2451020a(20) =3721a(21) =21122a(22) =23a(23) =234681224a(24) =525a(25) =21326a(26) =3927a(27) =2471428a(28) =29a(29) =2356101530