a>1
a:69=c,r
r=2c
a:69=C,2C
d=i x c+r,r<i
a=69 x c+2c,2c<69
2c apartine{1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,31
29,30,32,34}|:2(unde nu se imparte treci peste)
c apartine {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17}⇒exista 17 nr
