%I #9 Dec 30 2019 15:05:51

%S 1,5,6,10,17

%N Covering numbers C(n,7,4) (next term is <= 24).

%D CRC Handbook of Combinatorial Designs, 1996, p. 263.

%H D. Gordon, <a href="http://www.dmgordon.org/cover">La Jolla Repository of Coverings</a>

%H <a href="/index/Cor#covnum">Index entries for covering numbers</a>

%K nonn,hard

%O 7,2

%A _N. J. A. Sloane_.