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  2. Singly and doubly even - Wikipedia

    en.wikipedia.org/wiki/Singly_and_doubly_even

    A singly even number can be divided by 2 only once; it is even but its quotient by 2 is odd. A doubly even number is an integer ... 3 game shots in a row: D12, D6 ...

  3. Magic square - Wikipedia

    en.wikipedia.org/wiki/Magic_square

    Magic squares are generally classified according to their order n as: odd if n is odd, evenly even (also referred to as "doubly even") if n is a multiple of 4, oddly even (also known as "singly even") if n is any other even number. This classification is based on different techniques required to construct odd, evenly even, and oddly even squares.

  4. Parity (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Parity_(mathematics)

    Even and odd numbers have opposite parities, e.g., 22 (even number) and 13 (odd number) have opposite parities. In particular, the parity of zero is even. [2] Any two consecutive integers have opposite parity. A number (i.e., integer) expressed in the decimal numeral system is even or odd according to whether its last digit is even or odd. That ...

  5. Bell number - Wikipedia

    en.wikipedia.org/wiki/Bell_number

    The number on the left hand side of a given row is the Bell number for that row. ... the Bell numbers repeat the pattern odd-odd-even with period three.

  6. Siamese method - Wikipedia

    en.wikipedia.org/wiki/Siamese_method

    The Siamese method, or De la Loubère method, is a simple method to construct any size of n-odd magic squares (i.e. number squares in which the sums of all rows, columns and diagonals are identical). The method was brought to France in 1688 by the French mathematician and diplomat Simon de la Loubère , [ 1 ] as he was returning from his 1687 ...

  7. Parity of a permutation - Wikipedia

    en.wikipedia.org/wiki/Parity_of_a_permutation

    The permutation is odd if and only if this factorization contains an odd number of even-length cycles. Another method for determining whether a given permutation is even or odd is to construct the corresponding permutation matrix and compute its determinant. The value of the determinant is the same as the parity of the permutation.

  8. Odd–even sort - Wikipedia

    en.wikipedia.org/wiki/Oddeven_sort

    The oddeven sort algorithm correctly sorts this data in passes. (A pass here is defined to be a full sequence of oddeven, or evenodd comparisons. The passes occur in order pass 1: oddeven, pass 2: evenodd, etc.) Proof: This proof is based loosely on one by Thomas Worsch. [6]

  9. Gould's sequence - Wikipedia

    en.wikipedia.org/wiki/Gould's_sequence

    Pascal's triangle, rows 0 through 7. The number of odd integers in row i is the i-th number in Gould's sequence. The self-similar sawtooth shape of Gould's sequence. Gould's sequence is an integer sequence named after Henry W. Gould that counts how many odd numbers are in each row of Pascal's triangle. It consists only of powers of two, and ...