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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 (list; graph; refs; listen; history; text; internal format)
 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

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Last modified September 23 23:55 EDT 2023. Contains 365554 sequences. (Running on oeis4.)