Last number x such that primepi(n * x) = n + x.
41, 148, 409, 998, 2597, 6424, 15889, 39970, 100192, 251637
5
T. D. Noe, Plot of 10 terms
(Mma) Table[Last[Select[Range[1000000], PrimePi[n*#] == n + # &]], {n, 5, 14}]
Cf. S000263.
nonn,more
T. D. Noe, Sep 22 2014