A173479 a(n) = the smallest n-digit number ending in n-1 zeros that is divisible by n, else 0.

1, 10, 300, 1000, 10000, 300000, 7000000, 10000000, 900000000, 1000000000, 0, 300000000000, 0, 70000000000000, 300000000000000, 1000000000000000, 0, 900000000000000000, 0, 10000000000000000000, 0, 0, 0, 300000000000000000000000, 1000000000000000000000000, 0, 0, 7000000000000000000000000000, 0

Offset: 1

Author

Jaroslav Krizek, Feb 19 2010

Keywords

• nonn
• base

Comments

See A173478 - A173486.

Links

• Robert Israel, Table of n, a(n) for n = 1..999

Programs

Maple

f:= proc(n) local i; for i from 1 to 9 do if i*10^(n-1) mod n = 0 then return i*10^(n-1) fi od: 0 end proc:
map(f, [$1..20]); # Robert Israel, Jan 16 2017

Extensions

a(16)-a(29) from Robert Israel, Jan 16 2017