OFFSET
1,2
PROG
(PARI) is(n)=my(t=2*n, P=if(issquare(t, &t), t^numdiv(t^2), t^(numdiv(t)/2))); P%sigma(2*n)==numdiv(2*n) \\ Charles R Greathouse IV, Jun 19 2011
CROSSREFS
KEYWORD
nonn,less
AUTHOR
Juri-Stepan Gerasimov, Jun 18 2011
EXTENSIONS
More terms from Charles R Greathouse IV, Jun 19 2011
STATUS
approved