>>> a=1
>>> while(a<20):
...     print a,"x 7 =", a*7
...     a=a+1
... 
1 x 7 = 7
2 x 7 = 14
3 x 7 = 21
4 x 7 = 28
5 x 7 = 35
6 x 7 = 42
7 x 7 = 49
8 x 7 = 56
9 x 7 = 63
10 x 7 = 70
11 x 7 = 77
12 x 7 = 84
13 x 7 = 91
14 x 7 = 98
15 x 7 = 105
16 x 7 = 112
17 x 7 = 119
18 x 7 = 126
19 x 7 = 133
>>>