login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A244958 Smallest positive multiple of n whose base-7 representation contains only 0's and 1's. 2
0, 1, 8, 57, 8, 50, 19608, 7, 8, 351, 50, 2409, 19608, 351, 56, 2745, 400, 16864, 134856, 57, 400, 399, 2794, 17158, 19608, 50, 19552, 351, 56, 137257, 120450, 16864, 2752, 2409, 16864, 350, 134856, 117993, 19608, 351, 400, 134849, 137256, 344, 16808, 2745 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Eric M. Schmidt, Table of n, a(n) for n = 0..1000

Ed Pegg Jr., 'Binary' Puzzle

Eric M. Schmidt, Sage code to compute this sequence (use b=7)

Chai Wah Wu, Pigeonholes and repunits, Amer. Math. Monthly, 121 (2014), 529-533.

MATHEMATICA

Join[{0}, Module[{b701=Rest[FromDigits[#, 7]&/@Tuples[{0, 1}, 8]]}, Table[ SelectFirst[b701, Divisible[#, n]&], {n, 50}]]] (* Requires Mathematica version 10 or later *) (* Harvey P. Dale, Oct 18 2020 *)

CROSSREFS

Cf. A004287 (written in base 7), A004290, A244954-A244960.

Sequence in context: A009089 A296466 A202863 * A043071 A304352 A305915

Adjacent sequences:  A244955 A244956 A244957 * A244959 A244960 A244961

KEYWORD

nonn,base

AUTHOR

Eric M. Schmidt, Jul 09 2014

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified May 19 18:35 EDT 2022. Contains 353847 sequences. (Running on oeis4.)