OFFSET
0,2
EXAMPLE
For n=0..4, there is 1 root. For n=5..10, there are 5 roots. For n=11..17, there are 9 roots. etc... So first ranks are 0,5,11,18, ...
CROSSREFS
KEYWORD
nonn
AUTHOR
Sébastien Dumortier, Sep 28 2008
STATUS
approved