A023771 Nialpdromes: digits in base 16 are in nonincreasing order.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 32, 33, 34, 48, 49, 50, 51, 64, 65, 66, 67, 68, 80, 81, 82, 83, 84, 85, 96, 97, 98, 99, 100, 101, 102, 112, 113, 114, 115, 116, 117, 118, 119, 128, 129, 130, 131, 132, 133, 134, 135, 136, 144, 145

Offset: 1

Author

Olivier Gérard

Keywords

• nonn
• base
• easy

Links

• Vincenzo Librandi, Table of n, a(n) for n = 1..1000
• Eric Weisstein's World of Mathematics, Digit.
• Eric Weisstein's World of Mathematics, Nialpdrome.

Programs

Mathematica

Select[Range[0, 500], Max[Differences[IntegerDigits[#, 16]]]<=0&] (* Vincenzo Librandi, Dec 27 2012 *)
Select[Range[0,145],GreaterEqual@@IntegerDigits[#,16]&] (* Ray Chandler, Jan 06 2014 *)