

A129742


Numbers of the form: a(n)=((Prime[n]  1)!  (Prime[n]  1))/(2*Prime[n]).


0



0, 0, 2, 51, 164945, 18423138, 615376173176, 168483518571789, 24434798429947993043, 5256695596753687250025931034, 4278271932454694494134007741935
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OFFSET

1,3


COMMENTS

From the proof of Sir John Wilson's theorem:
numbers of sets of stellated pgons.


REFERENCES

G. E. Andrews, Number Theory, 1971, Dover Publications New York, p 39.


LINKS

Table of n, a(n) for n=1..11.


FORMULA

a(n)=((Prime[n]  1)!  (Prime[n]  1))/(2*Prime[n]).


MATHEMATICA

f[n_] = ((Prime[n]  1)!  (Prime[n]  1))/(2*Prime[n]); Table[f[n], {n, 1, 20}]
((#1)!#+1)/(2#)&/@Prime[Range[20]] (* Harvey P. Dale, Aug 12 2016 *)


CROSSREFS

Sequence in context: A099368 A132492 A030264 * A105647 A080921 A053455
Adjacent sequences: A129739 A129740 A129741 * A129743 A129744 A129745


KEYWORD

nonn


AUTHOR

Roger L. Bagula and Gary W. Adamson, Aug 25 2008


STATUS

approved



