OFFSET
0,2
COMMENTS
For all m>k, S^m(n)=n^2
FORMULA
a(n)=sqrt(n)+o(sqrt(n))
PROG
(PARI) a(n)=if(n<0, 0, z=1; c=0; while(abs(z-n^2)>0, z=n*ceil(sqrt(z)); c++); c)
CROSSREFS
KEYWORD
nonn
AUTHOR
Benoit Cloitre, Oct 07 2003
STATUS
approved