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

1,1

Links

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

Mathematica

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

Prog

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

Crossrefs

Cf. A064659-A064662.

Sequence in context: A027355 A127326 A321923 * A025923 A351358 A138158

Adjacent sequences: A064660 A064661 A064662 * A064664 A064665 A064666

Keyword

sign

Author

N. J. A. Sloane, Oct 10 2001

Status

approved