%I #16 Sep 11 2024 00:57:16
%S 0,0,0,0,0,0,2,1,5
%N Number of composite knots with n crossings.
%C A knot is composite if and only if it can be written as the knot sum of two nontrivial knots.
%F a(n) = A086825(n) - A002863(n), for all n > 0.
%e For n = 6 there are totally 5 knots out of which 3 are prime, so a(6) = 5 - 3 = 2.
%Y Cf. A086825, A002863.
%K nonn,hard,more,bref
%O 0,7
%A _Jens Ahlström_, Aug 20 2024