1/5+1/45+1/117+1/221+1/357
=2/9+1/117+1/221+1/357
=26/117+1/117+1/221+1/357
=3/13+1/221+1/357
=51/221+1/221+1/357
=4/17+1/357
=84/357+1/357
=5/21
1/5+1/45+1/117+1/221+1/357
=2/9+1/117+1/221+1/357
=26/117+1/117+1/221+1/357
=3/13+1/221+1/357
=51/221+1/221+1/357
=4/17+1/357
=84/357+1/357
=5/21