Keith Number

In recreational mathematics, a Keith number or repfigit number (short for repetitive Fibonacci-like digit) is a number in the following integer sequence:

14, 19, 28, 47, 61, 75, 197, 742, 1104, 1537, 2208, 2580, ....

Keith numbers were introduced by Mike Keith in 1987. They are computationally very challenging to find, with only about 100 known.

Read more about Keith Number:  Introduction, Definition, Finding Keith Numbers, Examples, Keith Clusters

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