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A117635 Royal elements sequence from A018226 plus closed next shell at 168: H,B,Cl,Mn,Ag,Au,X(Unknown). 0
1, 5, 17, 25, 47, 79, 165 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

The 168 (168-3) is arrived at as the inert gas state electrically when the next f electrons and the first g electrons are filled. It also agrees with the Meastro sequence at 13^2. This approach predicts a relatively stable state about 16 neutrons/protons lower than the Pythagoren approach mentioned in A018226. 168 also has the benefit of being the Klein SPL(2,7) and Fano projective Plane group element number in a geodetic geometric model.

LINKS

Table of n, a(n) for n=0..6.

FORMULA

a(n) = Abs[A018226[n]-3]

CROSSREFS

Cf. A018226.

Sequence in context: A242178 A063588 A307286 * A268526 A018447 A196142

Adjacent sequences:  A117632 A117633 A117634 * A117636 A117637 A117638

KEYWORD

nonn,uned

AUTHOR

Roger L. Bagula, Apr 08 2006

STATUS

approved

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Last modified September 15 22:10 EDT 2019. Contains 327088 sequences. (Running on oeis4.)