A217923 F-block elements for Janet periodic table.

57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102

Offset

1,1

Comments

From Paul Curtz, Oct 26 2012: (Start)

Tarantola's formulas for the Janet table:

Let D(n) = n*(n+1)*(n+2)/6 + (1-(-1)^n)*(n+1)/4 = A168380(n).

The row R at which the element with atomic number Z is to be placed is the unique value of R satisfying D(R-1) < Z <= D(R).

Once the row number R is determined, the column number is, from right to left, C = D(R) - Z + 1.

Example: Z=109. D(7) < Z <= D(8) = 120. C = 120 - 109 + 1 = 12. (End)

Links

Table of n, a(n) for n=1..28.

Wikipedia, The Janet periodic table

Mathematica

Join[Range[57, 70], Range[89, 102]]

Crossrefs

Cf. A160914 (s-block), A138469 (p-block), A199934 (d-block).

Sequence in context: A033377 A291496 A036184 * A346806 A136542 A042623

Adjacent sequences: A217920 A217921 A217922 * A217924 A217925 A217926

Keyword

nonn,tabf,fini

Author

Jean-François Alcover, Oct 15 2012

Status

approved