%I #6 Mar 30 2012 16:52:09
%S 5,6,7,10,12,15,16,18,19,22,23,25,27,29,30,32,34,36,38,40,42,44,46,48,
%T 49,50,52,54,55,57,58,60,61,63,64,66,67,69,71,72,74,76
%N Achromatic number of K_5 X K_n.
%D Hornak, Mirko and Pcola, Stefan, Achromatic number of K_5 X K_n for small n. Czechoslovak Math. J. 53 (128) (2003), no. 4, 963-988.
%D Hornak, Mirko and Pcola, Stefan, Achromatic number of K_5 X K_n for large n. Discrete Math. 234 (2001), no. 1-3, 159-169.
%F For n >= 43, a(n) = floor(9n/5).
%Y Cf. A206416.
%K nonn,more
%O 1,1
%A _N. J. A. Sloane_, Feb 07 2012