|
%I #11 Apr 10 2018 21:45:58
%S 0,1,2,2,4,5,6,4,6,9,10,10,12,13,14,8,16,15,18,18,20,21,22,20,20,25,
%T 18,26,28,29,30,16,32,33,34,30,36,37,38,36,40,41,42,42,42,45,46,40,42,
%U 45,50,50,52,45,54,52,56,57,58,58,60,61,60,32,64,65,66,66,68,69,70,60
%N Number of numbers k <= n such that at least one prime factor of n is not a prime factor of k.
%H Robert Israel, <a href="/A010848/b010848.txt">Table of n, a(n) for n = 1..10000</a>
%F a(n) = n-A003557(n). - _Vladeta Jovovic_, Sep 15 2006
%p f:= n -> n - n/convert(numtheory:-factorset(n),`*`):
%p map(f, [$1..100]); # _Robert Israel_, Apr 10 2018
%Y Cf. A008479, A010846, A010847.
%K nonn,easy
%O 1,3
%A _Olivier Gérard_
%E Definition corrected by _Vladeta Jovovic_, Sep 15 2006
|
