a(n) is the smallest number that has exactly n repdigit divisors.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =12a(5) =24a(6) =72a(7) =66a(8) =666a(9) =132a(10) =1332a(11) =264a(12) =2664a(13) =792a(14) =13320a(15) =3960a(16) =14652a(17) =26664a(18) =48840a(19) =29304a(20) =79992a(21) =341880a(22) =146520a(23) =399960a(24) =1333332a(25) =1025640a(26) =2799720a(27) =8879112a(28) =2666664a(29) =18666648