A064661 a(n) = n - floor( prime(n)/log(prime(n)) ).

-1, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 4, 5, 5, 6, 6, 7, 5, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 8, 7, 8, 8, 9, 8, 7, 8, 8, 9, 9, 10, 9, 9, 9, 9, 10, 10, 11, 11, 11, 10, 10, 11, 11, 10, 11, 10, 11, 11, 11, 11, 12, 12, 12, 12, 12, 13, 12, 12

Offset: 1

Author

N. J. A. Sloane, Oct 10 2001

Keywords

• sign

Links

• Harry J. Smith, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A064659-A064663.

Programs

Mathematica

Table[n-Floor[Prime[n]/Log[Prime[n]]],{n,90}] (* Harvey P. Dale, Sep 27 2017 *)

PARI

{ for (n=1, 1000, write("b064661.txt", n, " ", n - prime(n)\log(prime(n))) ) } \\ Harry J. Smith, Sep 21 2009