OFFSET
1,2
EXAMPLE
0 is in this sequence because 0^2/2 = 0.
PROG
(PARI) is(n)=if(n<2, return(n==0)); for(k=2, log(n)\log(2)+2, if(ispower(n*k, k), return(1))); 0 \\ Charles R Greathouse IV, Nov 01 2014
CROSSREFS
KEYWORD
nonn
AUTHOR
Juri-Stepan Gerasimov, Oct 13 2014
STATUS
approved