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2014-10-15T19:45:46+03:00

n=57·6 + r  = 342+r   r < 6   r∈{0,1,2,3,4,5} ⇒

n∈{342,343,344,345,346,347}   S=342+343+344+345+346+347  342=342

343=342+1

344=342+2

345=342+3

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

347=342+7 ⇒ S=342×7 + (1+2+3+.....+7) =342·7 = 7·8/2 = 342·7 + 7·4 = 7(342+4) = 7·346 = 2422

2 5 2