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2014-10-02T23:05:01+03:00

(1)     0=0

(2)     2 = 0+1·2

(3)      6 =0+2·3

(4)      12 =0+3.4

(5)       20 =0+4·5

.................

(2014)   N =0 + (n-1)·n = 2013 ·2014 = 4054182