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

0, 3, 6, 9, 15, 18, 27, 30, 33, 36, 39, 45, 48, 51, 54, 57, 60, 63, 66, 69, 81, 84, 87, 90, 93, 96, 99, 105, 108, 126, 129, 135, 138, 150, 153, 156, 159, 165, 168, 177, 180, 183, 186, 189, 195, 198, 225, 228, 252, 261, 264, 267, 270, 273, 282, 291, 294, 297

Offset

1,2

Comments

A007953(a(n)) = A007953(4*a(n)).

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.

Links

Harvey P. Dale, Table of n, a(n) for n = 1..1000

Example

15 belongs to the sequence, because A007953(15) = 6 = A007953(60) = A007953(4*15).

Mathematica

Select[Range[0, 300], Total[IntegerDigits[#]]==Total[IntegerDigits[4#]]&] (* Harvey P. Dale, Dec 25 2025 *)

Prog

(Magma) [n: n in [0..400] | &+Intseq(n) eq &+Intseq(4*n)]; // Vincenzo Librandi, Aug 05 2015

Crossrefs

Cf. A007953, A070279, A259727, A259729.

Sequence in context: A274191 A133331 A276381 * A000741 A133205 A355498

Adjacent sequences: A259725 A259726 A259727 * A259729 A259730 A259731

Keyword

nonn,base

Author

Christina Steffan, Jul 05 2015

Extensions

More terms from Vincenzo Librandi, Aug 05 2015

Status

approved