A031999 Numbers whose base-4 digits are in nonincreasing order.

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

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• base

Comments

Identical to A023760 apart from its first term. - Charles R Greathouse IV, May 03 2016

Links

• Harvey P. Dale, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A007090, A023760, A023786 (subset).

Programs

Mathematica

Select[Range[300], Max[Differences[IntegerDigits[#, 4]]] < 1 &] (* Harvey P. Dale, Apr 27 2017 *)