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
Keywords
Links
- Harry J. Smith, Table of n, a(n) for n = 1..1000
Programs
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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