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

Author

Paul Curtz, May 03 2008

Keywords

• nonn
• fini
• full
• less

Comments

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

Examples

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

Links

• Albert Tarantola, PSE of Elements (Janet form).

Crossrefs

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

Programs

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 *)

Extensions

Edited by R. J. Mathar, Oct 07 2009