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2014-05-15T16:05:24+03:00
F(1)=3/2
f(2)=4/2
f(3)=5/2
...........
f(2013)=2015/2

(3+4+5+....+2015)/2=N

3+4+5+....+2015=
(1+2+3+...+2015)-(1+2)=
2015*2016/2-3=
2015*1008-3=

2015*1008-3/2=
3 3 3