OFFSET
1,4
COMMENTS
Degree of Lagrange resolvent of polynomial of n-th degree. Equals degree of symmetric group of order n divided by order of metacyclic group of order n. - Artur Jasinski, Jan 22 2008
REFERENCES
J. L. Lagrange, Oeuvres, Vol. III Paris 1869.
FORMULA
a(n) = (n-1)!/phi(n).
a(n) = n!/A002618(n) - Artur Jasinski, Jan 22 2008
EXAMPLE
a(4)=3 because we have: <(1234)> = <(1432)>, <(1243)> = <(1342)>, <(1324)> = <(1423)>. - Geoffrey Critzer, Sep 07 2015
MATHEMATICA
Table[n!/(n EulerPhi[n]), {n, 1, 20}] (* Artur Jasinski, Jan 22 2008 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Christian G. Bower, Nov 14 2000
STATUS
approved