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A032938

Numbers whose base-3 representation Sum_{i=0..m} d(i)*3^(m-i) has d(i)=0 for all odd i.

1, 2, 3, 6, 9, 10, 11, 18, 19, 20, 27, 30, 33, 54, 57, 60, 81, 82, 83, 90, 91, 92, 99, 100, 101, 162, 163, 164, 171, 172, 173, 180, 181, 182, 243, 246, 249, 270, 273, 276, 297, 300, 303, 486, 489, 492, 513, 516, 519, 540, 543, 546, 729

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OFFSET

1,2

LINKS

Robert Israel, Table of n, a(n) for n = 1..10000

MAPLE

f:= proc(n, j) local L, m;

L:= convert(n, base, 3);

m:= nops(L);

j*add(L[i+1]*3^(2*i), i=0..m-1)

end proc:

seq(seq(seq(f(n, j), n=3^k..3^(k+1)-1), j=[1, 3]), k=0..3); # Robert Israel, Nov 15 2020

CROSSREFS

Cf. A007089 (numbers in base 3).

Sequence in context: A047404 A133555 A328727 * A188323 A090892 A120752

Adjacent sequences: A032935 A032936 A032937 * A032939 A032940 A032941

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

EXTENSIONS

Definition corrected by Robert Israel, Nov 15 2020

STATUS

approved

URL: https://oeis.org/A032938

⇱ A032938 - OEIS