OFFSET
1,2
COMMENTS
n <= A000005(n)^2/2 begins: 2, 4, 6, 8, 12, 18, 24, 30, 36, 48, 60, 72, 120.
EXAMPLE
PROG
(PARI) is(n)=numdiv(n)^2/2<n
CROSSREFS
KEYWORD
nonn
AUTHOR
Gerasimov Sergey, Aug 04 2012
STATUS
approved