Răspuns :
84+84=168 succes in continuare
168+84=252
252+84=336
336+84=420
420+84=504
504+84=588
588+84=672
672+84=756
756+84=840
840+84=924
924+84=1,008 etc
168+84=252
252+84=336
336+84=420
420+84=504
504+84=588
588+84=672
672+84=756
756+84=840
840+84=924
924+84=1,008 etc