a(n) is the smallest multiple of n that is a term of A072873.

Terms

a(0) =1a(1) =4a(2) =27a(3) =4a(4) =3125a(5) =108a(6) =823543a(7) =16a(8) =27a(9) =12500a(10) =285311670611a(11) =108a(13) =3294172a(14) =84375a(15) =16a(17) =108a(19) =12500a(20) =22235661a(23) =432a(24) =3125a(26) =27a(27) =3294172