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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
OFFSET
1,3
COMMENTS
From the proof of Sir John Wilson's theorem:
numbers of sets of stellated p-gons.
REFERENCES
G. E. Andrews, Number Theory, 1971, Dover Publications New York, p 39.
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 * A080921 A053455 A297947
KEYWORD
nonn
AUTHOR
STATUS
approved