OFFSET
1,2
COMMENTS
a(26) > 5*10^10. 205447718981 is also a term. - Donovan Johnson, Sep 30 2011
EXAMPLE
sigma(15463)*phi(15463) = 18056*12972 = 234222432.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Giovanni Resta, Feb 06 2006
EXTENSIONS
a(19)-a(25) from Donovan Johnson, Sep 30 2011
STATUS
approved