a) n-1 apartine divizorilor lui 14
n-1 apartine {1,2,7,14}
n-1=1 n=2
n-1=2 n=3
n-1=7 n=8
n-1=14 n=15
n apartine multimii {2,3,8,15}
b) 2n-1 apartine divizorilor lui 18
2n-1 apartine {1,2,3,6,9,18,-1,-2,-3,-6,-18}
2n-1=1 2n=2 n=1
2n-1=2 2n=3 n=3/2
2n-1=3 2n=4 n=2
2n-1=6 2n=7 n=7/2
2n-1=9 2n=8 n=4
2n-1=18 2n=19 n=19/2
2n-1=-1 2n=0 n=0
2n-1=-2 2n=-1 n=-1/2
2n-1=-3 2n=-2 n=-1
2n-1=-6 2n=-5 n=-5/2
2n-1=-9 2n=-8 n=-4
2n-1=-18 2n=-18 n=-17/2
n apartine multimii {1,2,4,0,-1,-4]
