login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A217923 F-block elements for Janet periodic table. 2
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)
OFFSET

1,1

COMMENTS

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)

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 * A136542 A042623 A072466

Adjacent sequences:  A217920 A217921 A217922 * A217924 A217925 A217926

KEYWORD

nonn,tabl,fini

AUTHOR

Jean-Fran├žois Alcover, Oct 15 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 6 10:14 EDT 2020. Contains 336245 sequences. (Running on oeis4.)