A182687 - OEIS

%I #6 Mar 30 2012 19:00:24

%S 1,2,4,6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,

%T 0,0,0,0,0,0

%N a(n) = the smallest 1-digit number with exactly n divisors, a(n) = 0 if no such number exists.

%F A000005(a(n)) = n for n <= 4.

%F 4 = max n such that a(n) > 0, a(n) = 0 for n > 4.

%Y Cf. A182688.

%K nonn,base,less

%O 1,2

%A _Jaroslav Krizek_, Nov 27 2010