OFFSET
1,1
COMMENTS
A115403 is a supersequence not requiring that p,q,r are distinct.
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
EXAMPLE
9^3+1=2*5*73 a product of 3 distinct primes, so 9 is in the sequence.
MATHEMATICA
Select[Range[400], Last/@FactorInteger[#^3 + 1] == {1, 1, 1}&] (* Vincenzo Librandi, Sep 15 2016 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
James R. Buddenhagen, Aug 02 2006
STATUS
approved