A Keith Number is an ndigit integer N with the following property: If a Fibonaccilike sequence (in which each term in the sequence is the sum of the n previous terms) is formed, with the first n terms being the decimal digits of the number N, then N itself occurs as a term in the sequence. For example, 197 is a Keith number since it generates the sequence:
1, 9, 7, 17, 33, 57, 107, 197, ...
