A294601 Numbers with exactly one odd decimal digit.

1, 3, 5, 7, 9, 10, 12, 14, 16, 18, 21, 23, 25, 27, 29, 30, 32, 34, 36, 38, 41, 43, 45, 47, 49, 50, 52, 54, 56, 58, 61, 63, 65, 67, 69, 70, 72, 74, 76, 78, 81, 83, 85, 87, 89, 90, 92, 94, 96, 98, 100, 102, 104, 106, 108, 120, 122, 124, 126, 128, 140, 142, 144, 146, 148, 160, 162, 164, 166, 168, 180

Offset

1,2

Comments

First differs from A054684 at position 56.

Numbers n such that A196564(n) = 1. - Felix Fröhlich, Nov 03 2017

There are (1+4*d)*5^(d-1) = 5*A081040(d+1) terms with d digits. - Robert Israel, Nov 06 2017

Links

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

Maple

Res:= NULL:
for t from 0 to 1000 do
  if nops(select(type, convert(t, base, 10), odd))=1 then Res:= Res, t fi
od:
Res;

Mathematica

Select[Range@ 200, Count[IntegerDigits@ #, _?OddQ] == 1 &] (* Michael De Vlieger, Nov 03 2017 *)

Prog

(PARI) a196564(n) = #select(x->x%2, digits(n)) \\ after Michel Marcus
is(n) = a196564(n)==1 \\ Felix Fröhlich, Nov 03 2017

Crossrefs

Cf. A014263, A054684, A081040, A196564, A275775.

Sequence in context: A308412 A327254 A054684 * A376692 A358529 A080207

Adjacent sequences: A294598 A294599 A294600 * A294602 A294603 A294604

Keyword

nonn,base,look

Author

Robert Israel, Nov 03 2017

Status

approved