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%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
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