A023791 Katadromes: digits in base 9 are in strict descending order.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 18, 19, 27, 28, 29, 36, 37, 38, 39, 45, 46, 47, 48, 49, 54, 55, 56, 57, 58, 59, 63, 64, 65, 66, 67, 68, 69, 72, 73, 74, 75, 76, 77, 78, 79, 171, 252, 261, 262, 333, 342, 343, 351, 352, 353, 414, 423, 424, 432, 433, 434, 441, 442

Offset

1,3

Links

Sean A. Irvine, Table of n, a(n) for n = 1..511

Mathematica

ktdQ[n_]:=AllTrue[Differences[IntegerDigits[n, 9]], #<0&]; Select[Range[ 0, 500], ktdQ] (* Harvey P. Dale, Feb 12 2022 *)

Crossrefs

Sequence in context: A131646 A032864 A032888 * A067043 A108690 A032944

Adjacent sequences: A023788 A023789 A023790 * A023792 A023793 A023794

Keyword

nonn,base,fini,full,easy

Author

Olivier Gérard

Status

approved