A124476 Smallest multiple of A047201(n) (i.e., numbers not divisible by 5) with only digits 6 and 7.

67, 76, 6777, 76, 7776, 6776, 776, 6777, 6677, 7776, 676, 6776, 7776, 6766, 7776, 76, 67767, 6776, 667, 7776, 676, 6777, 6776, 667, 67766, 7776, 66777777, 6766, 7776, 666777, 76, 77766, 7667, 76776, 676777, 6776, 67666, 667776, 7776, 67767, 67677

Offset: 1

Author

Lekraj Beedassy, Dec 17 2006

Keywords

• nonn
• base

Links

• Nick Hobson, Solution to Puzzle 80:"Sixes and sevens" (generalization of)

Programs

Mathematica

f[n_] := Block[{k = n},While[Union @ IntegerDigits[k] != {6, 7}, k += n];k];f /@ Select[Range[52], Mod[ #, 5] > 0 &] (* Ray Chandler, Dec 18 2006 *)

Extensions

Corrected and extended by Ray Chandler, Dec 18 2006