A099955 - OEIS

A099955

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

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

(list; graph; refs; listen; history; text; internal format)

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