If n is composite, replace n with the concatenation of its nontrivial divisors, otherwise a(n) = n.

Terms

a(0) =1a(1) =2a(2) =3a(3) =2a(4) =5a(5) =23a(6) =7a(7) =24a(8) =3a(9) =25a(10) =11a(11) =2346a(12) =13a(13) =27a(14) =35a(15) =248a(16) =17a(17) =2369a(18) =19a(19) =24510a(20) =37a(21) =211a(22) =23a(23) =2346812a(24) =5a(25) =213a(26) =39a(27) =24714a(28) =29a(29) =23561015