Nu avem voie să scriem:
5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, ...
7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, ...
3, 13, 23, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 43, 53, 63, 73...
Primele 10 case pot avea numerele:
1, 2, 4, 6, 8, 9, 11, 12, 15, 16