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Link to original content: http://en.wiktionary.org/wiki/hailstone_number
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hailstone number

From Wiktionary, the free dictionary

English

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Etymology

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The numbers are likened to hailstones because they "bounce" up and down before settling.

Noun

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hailstone number (plural hailstone numbers)

  1. (mathematics, informal, mostly plural) Any number appearing in a sequence described by the Collatz conjecture.