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a(n) = the smallest number ending in n+1 zeros divisible by n.
1

%I #8 Jun 28 2018 04:49:54

%S 100,1000,30000,100000,1000000,30000000,700000000,1000000000,

%T 90000000000,100000000000,11000000000000,30000000000000,

%U 1300000000000000,7000000000000000,30000000000000000

%N a(n) = the smallest number ending in n+1 zeros divisible by n.

%C See A173478 - A173486.

%H Robert Israel, <a href="/A173484/b173484.txt">Table of n, a(n) for n = 1..995</a>

%F a(n) = 10^(n+1)*A132740(n). - _Robert Israel_, Jun 28 2018

%p f:= n -> 10^(n+1)*n/2^padic:-ordp(n,2)/5^padic:-ordp(n,5):

%p map(f, [$1..30]); # _Robert Israel_, Jun 28 2018

%Y Cf. A132740.

%K nonn,base

%O 1,1

%A _Jaroslav Krizek_, Mar 04 2010