Concatenate n-th composite number with concatenation of its prime factors in ascending order.

Terms

a(0) =422a(1) =623a(2) =8222a(3) =933a(4) =1025a(5) =12223a(6) =1427a(7) =1535a(8) =162222a(9) =18233a(10) =20225a(11) =2137a(12) =22211a(13) =242223a(14) =2555a(15) =26213a(16) =27333a(17) =28227a(18) =30235a(19) =3222222a(20) =33311a(21) =34217a(22) =3557a(23) =362233a(24) =38219a(25) =39313a(26) =402225a(27) =42237a(28) =442211a(29) =45335