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Numbers whose base-4 digits are in nonincreasing order.
3

%I #23 Aug 14 2021 02:16:41

%S 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,

%T 57,58,60,61,62,63,64,80,84,85,128,144,148,149,160,164,165,168,169,

%U 170,192,208,212,213,224,228,229,232,233,234,240

%N Numbers whose base-4 digits are in nonincreasing order.

%C Identical to A023760 apart from its first term. - _Charles R Greathouse IV_, May 03 2016

%H Harvey P. Dale, <a href="/A031999/b031999.txt">Table of n, a(n) for n = 1..1000</a>

%t Select[Range[300], Max[Differences[IntegerDigits[#, 4]]] < 1 &] (* _Harvey P. Dale_, Apr 27 2017 *)

%Y Cf. A007090, A023760, A023786 (subset).

%K nonn,base

%O 1,2

%A _Clark Kimberling_