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%I #18 Sep 08 2022 08:46:13
%S 0,3,6,9,15,18,27,30,33,36,39,45,48,51,54,57,60,63,66,69,81,84,87,90,
%T 93,96,99,105,108,126,129,135,138,150,153,156,159,165,168,177,180,183,
%U 186,189,195,198,225,228,252,261,264,267,270,273,282,291,294,297
%N Sum of digits of a(n) equals the sum of digits of 4*a(n).
%C A007953(a(n)) = A007953(4*a(n)).
%C a(n) is a multiple of 3, but not all multiples of 3 belong to the sequence: e.g., 12 = 4*3: A007953(12) = 1 + 2 = 3, but A007953(4*12) = A007953(48) = 4 + 8 = 12.
%e 15 belongs to the sequence, because A007953(15) = 6 = A007953(60) = A007953(4*15).
%o (Magma) [n: n in [0..400] | &+Intseq(n) eq &+Intseq(4*n)]; // _Vincenzo Librandi_, Aug 05 2015
%Y Cf. A007953, A070279, A259727, A259729.
%K nonn,base
%O 1,2
%A _Christina Steffan_, Jul 05 2015
%E More terms from _Vincenzo Librandi_, Aug 05 2015
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