OFFSET
1,2
MATHEMATICA
Do[s=PrimePi[n*Prime[n]]/n; If[IntegerQ[s], Print[s]], {n, 1, 100000}]
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Labos Elemer, May 27 2003
EXTENSIONS
a(9)-a(12) from Giovanni Resta, Sep 02 2019
a(13) from Chai Wah Wu, May 14 2020
STATUS
approved