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A143041
10^n-th number divisible by exactly 3 distinct primes.
0
105, 455, 2988, 26128, 258764, 2677258, 28013887, 293553638, 3072062072, 32084334808
OFFSET
1,1
REFERENCES
J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 455, pp 94, Ellipses, Paris 2008.
FORMULA
a(n)=A033992(10^n).
CROSSREFS
Cf. A033992.
Sequence in context: A165060 A165069 A200834 * A078420 A152826 A133767
KEYWORD
more,nonn
AUTHOR
Lekraj Beedassy, Jul 18 2008
EXTENSIONS
a(8)-a(10) from Donovan Johnson, Mar 30 2010
STATUS
approved