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

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

Offset

1,2

Comments

Atomic numbers of hydrogen and then the alkali metals.

Links

Table of n, a(n) for n=1..7.

Formula

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

Example

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.

Sequence in context: A213540 A085616 A138723 * A138724 A134984 A138725

Adjacent sequences: A099952 A099953 A099954 * A099956 A099957 A099958

Keyword

nonn,fini,full

Author

Parthasarathy Nambi, Nov 12 2004

Extensions

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

Status

approved