A216812 Smallest positive number divisible by n whose decimal expansion has the form 22...200...0.

2, 2, 222, 20, 20, 222, 222222, 200, 222222222, 20, 2222222222, 2220, 222222222222, 222222, 2220, 2000, 2222222222222222, 222222222, 222222222222222222, 20, 222222

Offset

1,1

Links

Table of n, a(n) for n=1..21.

Formula

If n=3^k, a(n)=2(10^n-1)/9. For all n, a(n) <= 2(10^n-1)/9.

a(2^k)= 2*10^(k-1).

If p=prime, a(p) = 2(10^(p-1)-1)/9.

Crossrefs

Cf. A078241, A216481.

Sequence in context: A304915 A216481 A078241 * A068103 A335257 A119512

Adjacent sequences: A216809 A216810 A216811 * A216813 A216814 A216815

Keyword

nonn,base

Author

N. J. A. Sloane, Sep 18 2012

Status

approved