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单词 ExamplesOfKeithNumbers
释义

examples of Keith numbers


Take the number 47 as it is written in base 10, and start a Fibonacci-like sequence from its digits: 4, 7, 11, 18, 29, 47, …

42, on the other hand, isn’t a Keith number: 4, 2, 6, 8, 14, 22, 36, 58, etc.

For 3-digit numbers, the analogy is to the tribonacci sequence: 1, 9, 7, 17, 33, 57, 107, 197, …

In binary, 2 is a Keith number: 1, 0, 1, 1, 10, … Generalizing, b is a Keith number in base b only if it appears in the Fibonacci sequenceMathworldPlanetmath, and bx if in the applicable xbonacci sequence.

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更新时间:2025/5/5 0:37:06