A064663 a(n) = n - ceiling( prime(n)/log(prime(n)) ).

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

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-A064662.

Programs

Mathematica

Table[n-Ceiling[Prime[n]/Log[Prime[n]]],{n,90}] (* Harvey P. Dale, Dec 05 2012 *)

PARI

{ for (n=1, 1000, write("b064663.txt", n, " ", n - ceil( prime(n)/log(prime(n)) )) ) } \\ Harry J. Smith, Sep 21 2009