425:19=22 rest 7
deci primul nr va fi 425 ,urmatorul va fi mai mare cu 19,urmatorul mai mare cu 19.............etc pana la 881
425+(425+19)+(425+2x19)+(425+3x19)+..........+(425+456)=
425+425+19+425+2x19+425+3x19+....425+24x19=
425+425+425+...+19+2x19+3x19+....24x19= dam pe 19 factor comun
25x425+19(1+2+3+....24)=
25x425+19(24x25):2= dam pe 25 factor comun
25(425+19x24:2)=
25(425+19x12)=
25x(425+228)=
25x653=16325