%I #4 Mar 31 2012 10:26:07
%S 660,2262,10836,67512,510873,4357756,39780102,376957389,3650049088,
%T 35810556535
%N 10^n-th number divisible by exactly 4 distinct primes.
%D J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 455, pp 94, Ellipses, Paris 2008.
%F a(n)=A033993(10^n).
%Y Cf. A033993.
%K more,nonn
%O 1,1
%A _Lekraj Beedassy_, Jul 18 2008
%E a(8)-a(10) from _Donovan Johnson_, Mar 30 2010
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