A064663 - OEIS

%I #11 Jun 21 2018 01:58:56

%S -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,

%T 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,

%U 10,9,10,9,10,10,10,10,11,11,11,11,11,12,11,11,12,11

%N a(n) = n - ceiling( prime(n)/log(prime(n)) ).

%H Harry J. Smith, <a href="/A064663/b064663.txt">Table of n, a(n) for n = 1..1000</a>

%t Table[n-Ceiling[Prime[n]/Log[Prime[n]]],{n,90}] (* _Harvey P. Dale_, Dec 05 2012 *)

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

%Y Cf. A064659-A064662.

%K sign

%O 1,1

%A _N. J. A. Sloane_, Oct 10 2001