Lucas and Fibonacci Number Calculator
The Lucas series or Lucas numbers are an integer sequence. Fibonacci numbers and Lucas numbers form complementary instances of Lucas sequences.
The sequence of Lucas numbers is: 2, 1, 3, 4, 7, 11, 18, 29, 47, 76, 123,.....
Ln = 2 if n = 0;
Ln = 1 if n = 1;
Ln = Ln-1 + Ln-2 if n ＞ 1;