A126061 Number of letters in symbol for n-th element in periodic table.

1, 2, 2, 2, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 1, 1, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2

Offset

1,2

Links

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

Mark Winter, WebElements Periodic Table

Example

H for hydrogen (one letter), He for helium (two letters), Li for lithium (two letters), Be for beryllium (two letters), B for boron (one letter), C for carbon (one letter), N for nitrogen (one letter), O for oxygen (one letter), F for fluorine (one letter), Ne for neon (two letters) etc.

Crossrefs

Sequence in context: A128522 A025454 A327104 * A088496 A036602 A176166

Adjacent sequences: A126058 A126059 A126060 * A126062 A126063 A126064

Keyword

nonn,fini

Author

Neven Juric (neven.juric(AT)apis-it.hr), Feb 28 2007, Mar 01 2007

Extensions

a(100)-a(118) from Charles R Greathouse IV, Jul 13 2016

Status

approved