OFFSET
1,1
COMMENTS
This automorphism group is isomorphic to Z_2 X G where G is the group described in A002618.
FORMULA
a(n) = 2 * A002618(n) = 2 * n * Phi(n).
MAPLE
MATHEMATICA
Table[ 2n*EulerPhi[n], {n, 1, 45}]
PROG
(PARI) for(n=1, 100, print1(2*n*eulerphi(n), ", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Sharon Sela (sharonsela(AT)hotmail.com), May 28 2002
EXTENSIONS
Edited by Robert G. Wilson v and Benoit Cloitre, May 28 2002
STATUS
approved