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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A038365 Numbers n with property that digits of n are not present in 2n. 4
1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 14, 15, 16, 17, 18, 19, 22, 23, 27, 28, 29, 31, 32, 33, 34, 35, 36, 38, 39, 41, 43, 44, 45, 46, 48, 52, 53, 54, 55, 56, 57, 58, 59, 64, 65, 66, 67, 69, 72, 73, 76, 77, 78, 79, 82, 83, 85, 86, 88, 92, 93, 94, 111, 113, 114, 115, 116, 117, 118 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

207 is the smallest number containing a zero, cf. A192825. [Reinhard Zumkeller, Aug 09 2011]

LINKS

T. D. Noe, Table of n, a(n) for n=1..2000

EXAMPLE

36 is in the list since 2*36=72, which shares no digit with 36.

MATHEMATICA

Select[Range[140], Intersection[IntegerDigits[2 #], IntegerDigits[#]] =={}&]  (* Harvey P. Dale, Apr 30 2011 *)

PROG

(Haskell)

import Data.List (intersect)

a038365 n = a038365_list !! (n-1)

a038365_list = filter (\x -> null (show (2*x) `intersect` show x)) [1..]

-- Reinhard Zumkeller, Aug 09 2011

CROSSREFS

Cf. A129845 (complement).

Sequence in context: A106000 A267215 A039219 * A247761 A031185 A342441

Adjacent sequences:  A038362 A038363 A038364 * A038366 A038367 A038368

KEYWORD

nonn,easy,base,nice

AUTHOR

Erich Friedman

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 November 30 09:54 EST 2021. Contains 349419 sequences. (Running on oeis4.)