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
MATHEMATICA
Join[Range[57, 70], Range[89, 102]]
CROSSREFS
KEYWORD
nonn,tabf,fini
AUTHOR
Jean-François Alcover, Oct 15 2012
STATUS
approved