A061819 - OEIS

%I #7 Feb 13 2017 02:03:54

%S 0,3,12,21,30,33,102,111,120,123,132,201,210,213,222,231,300,303,312,

%T 321,330,333,1002,1011,1020,1023,1032,1101,1110,1113,1122,1131,1200,

%U 1203,1212,1221,1230,1233,1302,1311,1320,1323,1332,2001,2010,2013,2022,2031

%N Multiples of 3 containing only digits 0,1,2,3.

%H Harvey P. Dale, <a href="/A061819/b061819.txt">Table of n, a(n) for n = 1..1000</a>

%H <a href="/index/Ar#10-automatic">Index entries for 10-automatic sequences</a>.

%F a(n) = A007090(3n), i.e. can also be read as multiples of 3 (A008585) written in base 4.

%e 132 is a term containing digits less than 4.

%t Select[3*Range[0,750],Max[IntegerDigits[#]]<4&] (* _Harvey P. Dale_, Jul 10 2014 *)

%Y Cf. A061818.

%K nonn,base,easy

%O 1,2

%A _Amarnath Murthy_, May 28 2001

%E Corrected and extended by Larry Reeves (larryr(AT)acm.org) and _Henry Bottomley_, May 30 2001