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automorphic number
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Cathedrale St.Jean in Lyon, France has a 14th-century astronomical clock that shows religious feast days till the year 2019; Perpetual Calendar
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automorphic number

Learn about this topic in these articles:

definition and examples

  • See an explanation on Zeno's Achilles paradox, an infinite series concept used in finance to pay off mortgages
    In number game: Number patterns and curiosities

    An automorphic number is an integer whose square ends with the given integer, as (25)2 = 625, and (76)2 = 5776. Strobogrammatic numbers read the same after having been rotated through 180°; e.g., 69, 96, 1001.

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