A099955 Atomic numbers in first column in the Mendeleyev periodic table of elements.

1, 3, 11, 19, 37, 55, 87

Offset: 1

Author

Parthasarathy Nambi, Nov 12 2004

Keywords

• nonn
• fini
• full

Comments

Atomic numbers of hydrogen and then the alkali metals.

Examples

			The atomic number of sodium is 11.
		

Crossrefs

Cf. A099956, alkaline earth metals; A101648, metalloids; A101647, nonmetals (except halogens and noble gases); A097478, halogens; A018227, noble gases; A101649, poor metals.

Formula

a(n) = A018227(n-1) + 1. - Lekraj Beedassy, Mar 31 2006

Extensions

Edited by N. J. A. Sloane at the suggestion of Lekraj Beedassy, Jan 13 2008