A032959 Numbers whose base-9 representation Sum_{i=0..m} d(i)*9^(m-i) has even d(i) for all odd i.

1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15, 17, 18, 20, 22, 24, 26, 27, 29, 31, 33, 35, 36, 38, 40, 42, 44, 45, 47, 49, 51, 53, 54, 56, 58, 60, 62, 63, 65, 67, 69, 71, 72, 74, 76, 78, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 99, 100, 101, 102, 103

Offset

1,2

Links

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

Maple

filter:= proc(n) local L, i;
  L:= convert(n, base, 9);
  andmap(t -> type(L[t], even), [seq(i, i=nops(L)-1 .. 1, -2)])
end proc:
select(filter, [$1..200]); # Robert Israel, Jun 02 2026

Crossrefs

Sequence in context: A291453 A185660 A191839 * A275945 A061383 A059708

Adjacent sequences: A032956 A032957 A032958 * A032960 A032961 A032962

Keyword

nonn,base

Author

Clark Kimberling

Extensions

Definition corrected by Sean A. Irvine, Nov 17 2020

Status

approved