Number of sphenic numbers, i.e., numbers with exactly three distinct prime factors, up to 10^n.
A215218
Number of sphenic numbers, i.e., numbers with exactly three distinct prime factors, up to 10^n.
Terms
- a(0) =0a(1) =5a(2) =135a(3) =1800a(4) =19919a(5) =206964a(6) =2086746a(7) =20710806a(8) =203834084a(9) =1997171674a(10) =19522428788a(11) =190614467420
External references
- oeis: A215218