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A217923
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F-block elements for Janet periodic table.
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2
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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
(list;
table;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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Comment 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 the 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)
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LINKS
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Table of n, a(n) for n=1..28.
Wikipedia, The Janet periodic table
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MATHEMATICA
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Join[Range[57, 70], Range[89, 102]]
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CROSSREFS
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Cf. A160914 (s-block), A138469 (p-block), A199934 (d-block).
Sequence in context: A033377 A291496 A036184 * A136542 A042623 A072466
Adjacent sequences: A217920 A217921 A217922 * A217924 A217925 A217926
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KEYWORD
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nonn,tabl,fini
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AUTHOR
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Jean-François Alcover, Oct 15 2012
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STATUS
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approved
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