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A244960 Smallest positive multiple of n whose base 9 representation contains only 0's and 1's. 7
0, 1, 10, 9, 820, 10, 90, 91, 5380840, 9, 10, 7381, 7380, 91, 66430, 90, 43644592, 6562, 90, 7372, 820, 819, 65692, 7291, 48427560, 7300, 66430, 81, 532252, 59131, 90, 66340, 48368512, 66429, 6562, 66430, 7380, 532171, 7372, 819, 5380840, 82, 597870, 66349 (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=9)

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

PROG

(PARI) a(n, b=9) = if (n, k=1; while(vecmax(digits(k*n, b))>1, k++); k*n); \\ Michel Marcus, Jul 10 2014

CROSSREFS

Cf. A004289 (written in base 9), A004290, A244954-A244959.

Sequence in context: A243035 A070252 A038311 * A282560 A335556 A286775

Adjacent sequences:  A244957 A244958 A244959 * A244961 A244962 A244963

KEYWORD

nonn,base

AUTHOR

Eric M. Schmidt, Jul 09 2014

STATUS

approved

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Last modified January 27 06:18 EST 2022. Contains 350601 sequences. (Running on oeis4.)