6-digit numbers k such that: (a) the digits of k are from the set {1, 2, 3, 4, 5}, and (b) any digit that appears in k appears at least twice.
A171725
6-digit numbers k such that: (a) the digits of k are from the set {1, 2, 3, 4, 5}, and (b) any digit that appears in k appears at least twice.
Terms
- a(0) =111111a(1) =111122a(2) =111133a(3) =111144a(4) =111155a(5) =111212a(6) =111221a(7) =111222a(8) =111313a(9) =111331a(10) =111333a(11) =111414a(12) =111441a(13) =111444a(14) =111515a(15) =111551a(16) =111555a(17) =112112a(18) =112121a(19) =112122a(20) =112211a(21) =112212a(22) =112221a(23) =112222a(24) =112233a(25) =112244a(26) =112255a(27) =112323a(28) =112332a(29) =112424
External references
- oeis: A171725