A023789 Katadromes: digits in base 7 are in strict descending order.

0, 1, 2, 3, 4, 5, 6, 7, 14, 15, 21, 22, 23, 28, 29, 30, 31, 35, 36, 37, 38, 39, 42, 43, 44, 45, 46, 47, 105, 154, 161, 162, 203, 210, 211, 217, 218, 219, 252, 259, 260, 266, 267, 268, 273, 274, 275, 276, 301, 308, 309, 315, 316, 317, 322, 323, 324, 325

Offset

1,3

Comments

There are 127 terms in this sequence, the last of which is 800667. - Harvey P. Dale, Apr 24 2016

Links

Harvey P. Dale, Table of n, a(n) for n = 1..127

Mathematica

Select[Range[0, 400], Max[Differences[IntegerDigits[#, 7]]]<0&] (* or *) Rest[FromDigits[#, 7]&/@Select[Flatten[Permutations/@Subsets[ Range[ 0, 6], 7], 1], Max[ Differences[#]]<0&]] (* Harvey P. Dale, Apr 24 2016 *)

Crossrefs

Sequence in context: A277908 A032862 A032886 * A032996 A032942 A273734

Adjacent sequences: A023786 A023787 A023788 * A023790 A023791 A023792

Keyword

nonn,base,fini,full,easy

Author

Olivier Gérard

Status

approved