OFFSET
1,3
COMMENTS
Related to Wilson's Theorem. Let p be a prime number and write 1/p - (p-1)/p! = x/(p-1)!. Then x = (p-1)!/p - (p-1)*(p-1)!/p! = (p-1)!/p - (p-1)/p.
Also, a(n) = floor((p-1)!/p). [Bruno Berselli, May 31 2013]
If b(1)=1, and b(m) = ((m-1)^2 / m) *(b(m-1)+(m-3)/(m-1)) for m>1, then a(n) are the terms of b(m) for m prime. [Pedro Caceres, Dec 30 2018]
EXAMPLE
Prime(4)=7 so a(4) = 6!/7 - 6*6!/7! = 102
MATHEMATICA
A091330[n_] := Block[{p = Prime[n]}, ((p - 1)!/p) - ((p - 1)*(p - 1)!/p!)] (* Robert G. Wilson v, Mar 02 2004 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Russell Easterly, Mar 01 2004
EXTENSIONS
More terms from Robert G. Wilson v and Ray Chandler, Mar 02 2004
STATUS
approved