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A032941 Numbers whose base-6 representation Sum_{i=0..m} d(i)*6^(m-i) has d(i)=0 for all odd i. 1
1, 2, 3, 4, 5, 6, 12, 18, 24, 30, 36, 37, 38, 39, 40, 41, 72, 73, 74, 75, 76, 77, 108, 109, 110, 111, 112, 113, 144, 145, 146, 147, 148, 149, 180, 181, 182, 183, 184, 185, 216, 222, 228, 234, 240, 246, 432, 438, 444, 450, 456, 462 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

MAPLE

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

L:= convert(n, base, 6);

m:= nops(L);

j*add(L[i+1]*6^(2*i), i=0..m-1)

end proc: seq(seq(seq(f(n, j), n=6^k..6^(k+1)-1), j=[1, 6]), k=0..2); # Robert Israel, Nov 16 2020

MATHEMATICA

Join[{1, 2, 3, 4, 5}, Select[Range[500], Union[Take[IntegerDigits[#, 6], {2, -1, 2}]]=={0}&]] (* Harvey P. Dale, Jul 06 2019 *)

CROSSREFS

Cf. A007092 (numbers in base 6).

Sequence in context: A322570 A108320 A177958 * A273733 A218345 A059460

Adjacent sequences: A032938 A032939 A032940 * A032942 A032943 A032944

KEYWORD

nonn,base

AUTHOR

Clark Kimberling

EXTENSIONS

Definition corrected by Robert Israel, Nov 16 2020

STATUS

approved

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Last modified February 3 19:19 EST 2023. Contains 360044 sequences. (Running on oeis4.)