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A138101
The atomic numbers read along the even-indexed rows of the Janet table of the elements.
5
3, 4, 13, 14, 15, 16, 17, 18, 19, 20, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120
OFFSET
1,1
COMMENTS
The union with A138100 gives the first 120 terms of A000027.
LINKS
Albert Tarantola, PSE of Elements (Janet form).
Anonymous, Janet periodic table, Web Elements Chemistry Nexus
EXAMPLE
Starts with 3 and 4 of the 2nd row (Li and Be). Next come 13 to 20 of the 4th row (Al to Ca).
MATHEMATICA
Table[Range[2 Ceiling[n/2]^2] + (# + 1) (3 + 2 #^2 + 4 # - 3 (-1)^#)/12 &[n - 1], {n, 2, 8, 2}] // Flatten (* Michael De Vlieger, Jul 21 2016 *)
CROSSREFS
Cf. A000027, A138100 (odd-indexed rows), A138509 (Left-step Janet periodic table), A137583, A172002.
Sequence in context: A342675 A330158 A082197 * A287089 A095790 A109474
KEYWORD
nonn,less,fini,full
AUTHOR
Paul Curtz, May 03 2008
EXTENSIONS
Edited by R. J. Mathar, Oct 07 2009
STATUS
approved