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A138100 The atomic numbers read along the odd-indexed rows of the Janet table of the elements. 5
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified August 26 03:38 EDT 2019. Contains 326324 sequences. (Running on oeis4.)