A023743 Base 5 expansion uses each positive digit just once.

194, 198, 214, 222, 238, 242, 294, 298, 334, 346, 358, 366, 414, 422, 434, 446, 482, 486, 538, 542, 558, 566, 582, 586, 694, 698, 714, 722, 738, 742, 894, 898, 954, 970, 978, 990, 1014, 1022, 1054, 1070, 1102, 1110, 1138

Offset

1,1

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..3000

Example

194 in base 5 is 1234.
1138 in base 5 is 14023; 14510 in base 5 is 431020. - Harvey P. Dale, Jul 26 2018

Mathematica

Union[ Map[ Plus@@(Array[ (5^#)&, Length[ # ], 0 ]*#)&, Flatten[ Table[ Permutations[ Join[ Range[ 5-1 ], Array[ 0&, k ] ] ], {k, 0, 1} ], 1 ] ] ]
Table[FromDigits[#, 5]&/@Permutations[PadRight[{1, 2, 3, 4}, n, 0]], {n, 4, 5}]//Flatten//Union (* Harvey P. Dale, Jul 26 2018 *)

Crossrefs

Sequence in context: A344147 A198483 A115735 * A025333 A025325 A294578

Adjacent sequences: A023740 A023741 A023742 * A023744 A023745 A023746

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved