Evaluate what happens when n is a number, starting with 0...
Row №. Result
1 Not matched
2 Not matched
3 Not matched
4 3 × 0 = 0. Add 4 and get a match for row № 4!
5 Not matched
6 Not matched
7 3 × 1 = 3. Add 4 and get a match for row № 7!
8 Not matched
9 Not matched
10 3 × 2 = 6. Add 4 and get a match for row № 10!