OFFSET
1,1
EXAMPLE
PROG
(PARI) is(n)=numdiv(sigma(n))!=sigma(numdiv(n)) \\ Charles R Greathouse IV, Jun 25 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
Jaroslav Krizek, Jul 16 2009
EXTENSIONS
Edited by R. J. Mathar, Jul 21 2009
STATUS
approved