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A217923
F-block elements for Janet periodic table.
3
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)
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
KEYWORD
nonn,tabf,fini
AUTHOR
STATUS
approved