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%I #17 Jun 19 2014 11:54:50
%S 1,3,11,19,37,55,87
%N Atomic numbers in first column in the Mendeleyev periodic table of elements.
%C Atomic numbers of hydrogen and then the alkali metals.
%F a(n) = A018227(n-1) + 1. - _Lekraj Beedassy_, Mar 31 2006
%e The atomic number of sodium is 11.
%Y Cf. A099956, alkaline earth metals; A101648, metalloids; A101647, nonmetals (except halogens and noble gases); A097478, halogens; A018227, noble gases; A101649, poor metals.
%K nonn,fini,full
%O 1,2
%A _Parthasarathy Nambi_, Nov 12 2004
%E Edited by _N. J. A. Sloane_ at the suggestion of Lekraj Beedassy, Jan 13 2008
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