A138100 The atomic numbers read along the odd-indexed rows of the Janet table of the elements.

1, 2, 5, 6, 7, 8, 9, 10, 11, 12, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88

Offset

1,2

Comments

The union with A138101 gives the first 120 terms of A000027.

Links

Table of n, a(n) for n=1..60.

Albert Tarantola, PSE of Elements (Janet form).

Example

Starts with 1 and 2 of the first row (H and He). Next come 5 to 12 of the 3rd row (B to Mg).

Mathematica

Table[Range[2 Ceiling[n/2]^2] + (# + 1) (3 + 2 #^2 + 4 # - 3 (-1)^#)/12 &[n - 1], {n, 1, 7, 2}] // Flatten (* Michael De Vlieger, Jul 21 2016 *)

Crossrefs

Cf. A000027, A138101 (even-indexed rows), A138509 (Left-step Janet periodic table), A137583, A172002.

Sequence in context: A039135 A072957 A073416 * A039097 A047581 A039067

Adjacent sequences: A138097 A138098 A138099 * A138101 A138102 A138103

Keyword

nonn,fini,full,less

Author

Paul Curtz, May 03 2008

Extensions

Edited by R. J. Mathar, Oct 07 2009

Status

approved