68915 : ab = x rest 11
ab×x = 68915 - 11 = 68904
46 385 : ab = y rest 17
ab×y = 46 385 - 17 = 46 368
68904 = 2^3 × 3^3 × 11 × 29
46368 = 2^5 × 3^2 × 7 × 23
----------------------------
c.m.m.d.c = 2^3 × 3^2 = 72
68915 : 72 = 957 rest 11
46385 : 72 = 644 rest 17
ab = 72 (numarul cautat)
