A023760 Nialpdromes: digits in base 4 are in nonincreasing order.

0, 1, 2, 3, 4, 5, 8, 9, 10, 12, 13, 14, 15, 16, 20, 21, 32, 36, 37, 40, 41, 42, 48, 52, 53, 56, 57, 58, 60, 61, 62, 63, 64, 80, 84, 85, 128, 144, 148, 149, 160, 164, 165, 168, 169, 170, 192, 208, 212, 213, 224, 228, 229, 232, 233, 234, 240, 244, 245, 248

Offset

1,3

Links

Vincenzo Librandi, Table of n, a(n) for n = 1..1001 (adapted to the new offset from Bruno Berselli)

Mathematica

Select[Range[0, 4000], Max[Differences[IntegerDigits[#, 4]]] <= 0 &] (* Vincenzo Librandi, Dec 26 2012 *)
Select[Range[0, 250], GreaterEqual@@IntegerDigits[#, 4] &] (* Ray Chandler, Jan 06 2014 *)

Crossrefs

Cf. A023786 (subset), A031999 (slightly different version).

Sequence in context: A356713 A032867 A031999 * A032901 A260113 A005792

Adjacent sequences: A023757 A023758 A023759 * A023761 A023762 A023763

Keyword

nonn,base,easy

Author

Olivier Gérard

Status

approved