Răspuns:
n=25a+13/-13 n-13=25a
n=70b+13/-13 n-13=70b n-13=[25, 70, 100]*k n-13=5^2*2^2*7*k
n=100c+13-13 n-13=100c n-13=25*4*7*k
n-13=700k
n=700k+13
n=713; 1413; 2113
Explicație pas cu pas:
