%I #5 Mar 30 2012 18:51:57
%S 1,4,21,22,23,24,25,26,27,28,29,30,5,6,7,8,9,2
%N Atomic numbers at the top of the 18 groups of the Mendeleyev-Seaborg table A138724.
%C This refers to the following 18 elements at the top of their groups: H, Be, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, B, C, N, O, F, He.
%Y Cf. A138718, A135559.
%K nonn,fini,full,less
%O 0,2
%A _Paul Curtz_, May 05 2008