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 A259728 Sum of digits of a(n) equals the sum of digits of 4*a(n). 3

%I

%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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Last modified September 23 04:54 EDT 2020. Contains 337295 sequences. (Running on oeis4.)