n:3=c1, r=2
n:5=c2, r=2
Conform teoremei impartirii cu rest=> n=3c1+2
n=5c2+2
=> n-2=3c1
n-2=5c2
=> 3c1=5c2
Daca c1=1=> 3*1=5c2 imposibil.
Daca c1=2=> 3*2=5c2 imposibil.
Daca c1=3=> 3*3=5c2 imposibil.
Daca c1=4=> 3*4=5c2 imposibil.
Daca c1=5=> 3*5=5c2=> c2=3=> n-2=15=>n=17 e cel mai mic numar