A143041 10^n-th number divisible by exactly 3 distinct primes.

105, 455, 2988, 26128, 258764, 2677258, 28013887, 293553638, 3072062072, 32084334808

Offset: 1

Author

Lekraj Beedassy, Jul 18 2008

Keywords

• more
• nonn

References

• J.-M. De Koninck, Ces nombres qui nous fascinent, Entry 455, pp 94, Ellipses, Paris 2008.

Crossrefs

Cf. A033992.

Formula

a(n)=A033992(10^n).

Extensions

a(8)-a(10) from Donovan Johnson, Mar 30 2010