OFFSET
1,1
COMMENTS
Numbers with 8 prime divisors also occur among cases satisfying relation d^3>n.
Prime divisors are counted without multiplicity. [From Harvey P. Dale, May 14 2012]
LINKS
Donovan Johnson, Table of n, a(n) for n = 1..254 (complete sequence)
FORMULA
d[n]^3 > n, n=(p^w)*(q^u), d[]=A000005()
EXAMPLE
The sequence is finite and almost surely complete. Between 270000 and 17000000 no more cases were found. The last 3 entries are: 165888,186624,248832. E.g. n=1024*343=248832, with 66 divisors and d^3=287496>248832
MATHEMATICA
Select[Range[180], PrimeNu[#]==2&&DivisorSigma[0, #]^3>#&] (* Harvey P. Dale, May 14 2012 *)
CROSSREFS
KEYWORD
fini,full,nonn
AUTHOR
Labos Elemer, Aug 16 2000
STATUS
approved