Iterations of "n->n/2 if n even, n->3n-1 if n odd" (A001281) starting at these numbers reach 5.

Terms

a(0) =5a(1) =7a(2) =9a(3) =10a(4) =13a(5) =14a(6) =18a(7) =19a(8) =20a(9) =26a(10) =27a(11) =28a(12) =35a(13) =36a(14) =38a(15) =40a(16) =47a(17) =51a(18) =52a(19) =54a(20) =56a(21) =63a(22) =70a(23) =72a(24) =75a(25) =76a(26) =80a(27) =81a(28) =89a(29) =93