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

Author

Olivier Gérard

Keywords

• nonn
• base
• easy

Links

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

Crossrefs

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

Programs

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 *)