This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A137306 Related to A018226 and A018227: due to the stable element 118 (last term in A018227) this is submitted as a suggested new observed list with 459 as a probable next new atomic weight stable island. 0
 2, 8, 20, 28, 50, 83, 118, 126, 168, 194, 298 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS "These are crucial to the notion of an 'island of stability', which Glenn Seaborg espoused." REFERENCES Y. Oganessian, J. Phys. G: Nucl. Part. Phys, 2007, iop.org Rosenfeld, L. (1948). Nuclear Forces. Interscience Publishers, New York, xvii. G. T. Seaborg - Contemporary Physics, 2004, informaworld.com LINKS FORMULA Roughly a(n) = Floor[1.53*a(n-1)] MATHEMATICA (* nuclear radius visualization from Rosenfeld*) Clear[r, A, r0, p, n, m] A[p_, n_] := If[p == 0, 1, p + n] r0 = 1.3214405*10^(-13); r[p_, n_] := r0*( 1 + 0.8*(n/A[p, n])^2 - 0.3/A[p, n]^(1/3) + 0.010*p^2/A[p, n]^(4/3)) a0 = Table[Table[r[p, n], {n, p, Floor[2*p]}], {p, 0, 120}]; ListPlot[Flatten[a0]] CROSSREFS Cf. A018226, A018227. Sequence in context: A190640 A018226 A162626 * A110856 A048041 A217513 Adjacent sequences:  A137303 A137304 A137305 * A137307 A137308 A137309 KEYWORD nonn,obsc,uned AUTHOR Roger L. Bagula, Apr 20 2008 EXTENSIONS Definition not clear to me. - N. J. A. Sloane, Apr 25 2008 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .