Fibonaci and Lucas numbers
The first two Fibonaci numbers are 1 and 2 and the serie continues by adding the preceding two numbers. So you get 1, 2, 3, 5, 8, 13, 21, 34 and so on.
The Lucas numbers are constructed in a similar manner except that the first two numbers are 1 and 3. So you get 1, 3, 4, 7, 11, 18, 29, 47 and so on.
Altogether for both series, there are 8 numbers out of the 49 in a 6/49 lottery.