login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A294601 Numbers with exactly one odd decimal digit. 1
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 (list; graph; refs; listen; history; text; internal format)
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 * A080207 A187347 A187413

Adjacent sequences:  A294598 A294599 A294600 * A294602 A294603 A294604

KEYWORD

nonn,base,look

AUTHOR

Robert Israel, Nov 03 2017

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 8 02:45 EDT 2020. Contains 336290 sequences. (Running on oeis4.)