Numbers k with the property that k divides one of the concatenations (k-1)(k-2) or (k-2)(k-1).

Terms

a(0) =2a(1) =3a(2) =4a(3) =6a(4) =7a(5) =17a(6) =34a(7) =51a(8) =67a(9) =167a(10) =334a(11) =501a(12) =667a(13) =1667a(14) =3334a(15) =5001a(16) =6667a(17) =14286a(18) =16667a(19) =33334a(20) =50001a(21) =66667a(22) =166667a(23) =333334a(24) =500001a(25) =666667a(26) =1666667a(27) =2857143a(28) =3333334a(29) =5000001