1,4

G. C. Greubel, Table of n, a(n) for n = 1..1000

a(n) = floor(A000290(n)/A000040(n)).

A000290(n) = a(n)*A000040(n)) + A069547(n).

Table[Floor[n^2/Prime[n]], {n, 1, 50}] (* G. C. Greubel, May 21 2017 *)

(PARI) for(n=1, 50, print1(floor(n^2/prime(n)), ", ")) \\ G. C. Greubel, May 21 2017

Cf. A000040, A000290, A001221, A069547.

Sequence in context: A227568 A232746 A052146 * A108955 A108956 A289133

Adjacent sequences: A097879 A097880 A097881 * A097883 A097884 A097885

nonn

Reinhard Zumkeller, Sep 02 2004

approved