(1+2+3+.....116)=(1+116)*(116:2)=117*58=6786
117+2*6786=117+13572=13689
radical din 13689=117
(1+2+3+.....2006)=(1+2006)*(2006:2)=2007*1003=2013021
2001+2*2013021=2001+4026042=4028043
radical din 4028043 nu se extrage exact, deci radical din 4028043=2006.99851