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  2. Repeating decimal - Wikipedia

    en.wikipedia.org/wiki/Repeating_decimal

    The repeating sequence of digits is called "repetend" which has a certain length greater than 0, also called "period". [5] In base 10, a fraction has a repeating decimal if and only if in lowest terms, its denominator has any prime factors besides 2 or 5, or in other words, cannot be expressed as 2 m 5 n, where m and n are non-negative integers.

  3. Transposable integer - Wikipedia

    en.wikipedia.org/wiki/Transposable_integer

    The integer X is the repeating digits of the fraction 1 ⁄ F, say ab***. The multiple is thus the repeating digits of the fraction 3 ⁄ F, say b***a. In order for this cyclic permutation to take place, then 3 shall be the next remainder in the long division for 1 ⁄ F. Thus F shall be 7 as 1 × 10 ÷ 7 gives remainder 3. This yields the ...

  4. Cyclic number - Wikipedia

    en.wikipedia.org/wiki/Cyclic_number

    Cyclic numbers are related to the recurring digital representations of unit fractions.A cyclic number of length L is the digital representation of . 1/(L + 1).Conversely, if the digital period of 1/p (where p is prime) is

  5. Prime reciprocal magic square - Wikipedia

    en.wikipedia.org/wiki/Prime_reciprocal_magic_square

    In contrast with its rows and columns, the diagonals of this square do not sum to 27; however, their mean is 27, as one diagonal adds to 23 while the other adds to 31.. All prime reciprocals in any base with a period will generate magic squares where all rows and columns produce a magic constant, and only a select few will be full, such that their diagonals, rows and columns collectively yield ...