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

1,2

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

Mathematica

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

Crossrefs

Cf. A007090, A023760, A023786 (subset).

Sequence in context: A371290 A356713 A032867 * A023760 A032901 A260113

Adjacent sequences: A031996 A031997 A031998 * A032000 A032001 A032002

Keyword

nonn,base

Author

Clark Kimberling

Status

approved