A213746 Position in alphabet of first letter of symbol for chemical element with atomic number n.

8, 8, 12, 2, 2, 3, 14, 15, 6, 14, 14, 13, 1, 19, 16, 19, 3, 1, 11, 3, 19, 20, 22, 3, 13, 6, 3, 14, 3, 26, 7, 7, 1, 19, 2, 11, 18, 19, 25, 26, 14, 13, 20, 18, 18, 16, 1, 3, 9, 19, 19, 20, 9, 24, 3, 2, 12, 3, 16, 14, 16, 19, 5, 7, 20, 4, 8, 5, 20, 25, 12, 8, 20, 23, 18, 15, 9, 16, 1, 8, 20, 16, 2, 16, 1, 18, 6, 18, 1, 20, 16, 21, 14, 16, 1, 3, 2, 3, 5, 6, 13, 14, 12, 18, 4, 19, 2, 8, 13, 4, 18, 3, 14, 6, 13, 12, 20, 15

Offset

1,1

Comments

The symbol, not the name, decides the value. For example, Sodium starts with S, but the symbol is Na, and Na starts with N, so a(11) = 14.

a(114) = 6 and a(116) = 12.

Links

Table of n, a(n) for n=1..118.

Wikipedia, List of chemical elements

Example

a(3) = 12 because Lithium is Li and the first letter of Li is L.

Mathematica

Table[ToCharacterCode[StringTake[ElementData[i, "Abbreviation"], 1]][[1]] - 64, {i, 112}] (* T. D. Noe, Oct 01 2012 *)

Crossrefs

Sequence in context: A298916 A329032 A001732 * A219236 A259532 A329822

Adjacent sequences: A213743 A213744 A213745 * A213747 A213748 A213749

Keyword

nonn,fini,word

Author

J. Lowell, Jun 19 2012, corrected Oct 01 2012

Extensions

a(113)-a(118) from J. Lowell, Dec 08 2016

Status

approved