OFFSET
1,1
COMMENTS
a(8) <= 1524139588224. - Donovan Johnson, Dec 14 2009
EXAMPLE
k=284229: sigma(284229) = 482790 = 2*3*5*7*11*19, phi(284229) = 166320 = 2*2*2*3*3*3*3*5*7*11, common factor set = {2,3,5,7,11}, gcd(sigma,phi) = 2310.
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Labos Elemer, Mar 28 2003
EXTENSIONS
a(6) corrected and a(7) from Donovan Johnson, Dec 14 2009
STATUS
approved