A032944 Numbers whose base-9 representation Sum_{i=0..m} d(i)*9^(m-i) has d(i)=0 for all odd i.

1, 2, 3, 4, 5, 6, 7, 8, 9, 18, 27, 36, 45, 54, 63, 72, 81, 82, 83, 84, 85, 86, 87, 88, 89, 162, 163, 164, 165, 166, 167, 168, 169, 170, 243, 244, 245, 246, 247, 248, 249, 250, 251, 324, 325, 326, 327, 328, 329, 330, 331, 332, 405, 406

Offset

1,2

Links

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

Maple

b:= 9:
f:= proc(n, j) local L, m;
  L:= convert(n, base, b);
  m:= nops(L);
  j*add(L[i+1]*b^(2*i), i=0..m-1)
end proc:
seq(seq(seq(f(n, j), n=b^k..b^(k+1)-1), j=[1, b]), k=0..2); # Robert Israel, Nov 16 2020

Crossrefs

Cf. A007095 (numbers in base 9).

Sequence in context: A023791 A067043 A108690 * A273736 A048409 A066565

Adjacent sequences: A032941 A032942 A032943 * A032945 A032946 A032947

Keyword

nonn,base

Author

Clark Kimberling

Extensions

Definition corrected by Robert Israel, Nov 16 2020

Status

approved