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  2. Electoral threshold - Wikipedia

    en.wikipedia.org/wiki/Electoral_threshold

    The number of votes that means that a party is guaranteed a seat can be calculated by the formula (+ +) where ε is the smallest possible number of votes. That means that in a district with four seats slightly more than 20 percent of the votes will guarantee a seat.

  3. Betrothed numbers - Wikipedia

    en.wikipedia.org/wiki/Betrothed_numbers

    They are generalizations of the concepts of betrothed numbers and quasiperfect numbers. The first quasi-sociable sequences, or quasi-sociable chains, were discovered by Mitchell Dickerman in 1997: 1215571544 = 2^3*11*13813313; 1270824975 = 3^2*5^2*7*19*42467; 1467511664 = 2^4*19*599*8059; 1530808335 = 3^3*5*7*1619903; 1579407344 = 2^4*31^2*59*1741

  4. Unseated members of the United States Congress - Wikipedia

    en.wikipedia.org/wiki/Unseated_members_of_the...

    Both houses of the United States Congress have refused to seat new members based on Article I, Section 5 of the United States Constitution which states that: "Each House shall be the judge of the elections, returns and qualifications of its own members, and a majority of each shall constitute a quorum to do business; but a smaller number may adjourn from day to day, and may be authorized to ...

  5. United States congressional apportionment - Wikipedia

    en.wikipedia.org/wiki/United_States...

    Allocation of seats by state, as percentage of overall number of representatives in the House, 1789–2020 census. United States congressional apportionment is the process [1] by which seats in the United States House of Representatives are distributed among the 50 states according to the most recent decennial census mandated by the United States Constitution.

  6. Amicable numbers - Wikipedia

    en.wikipedia.org/wiki/Amicable_numbers

    In mathematics, the amicable numbers are two different natural numbers related in such a way that the sum of the proper divisors of each is equal to the other number. That is, s ( a )= b and s ( b )= a , where s ( n )=σ( n )- n is equal to the sum of positive divisors of n except n itself (see also divisor function ).

  7. Sociable number - Wikipedia

    en.wikipedia.org/wiki/Sociable_number

    The period of the sequence, or order of the set of sociable numbers, is the number of numbers in this cycle. If the period of the sequence is 1, the number is a sociable number of order 1, or a perfect number—for example, the proper divisors of 6 are 1, 2, and 3, whose sum is again 6.

  8. Quasiperfect number - Wikipedia

    en.wikipedia.org/wiki/Quasiperfect_number

    For a perfect number n the sum of all its divisors is equal to 2n. For an almost perfect number n the sum of all its divisors is equal to 2n - 1. Numbers n exist whose sum of factors = 2n + 2. They are of form 2^(n - 1) * (2^n - 3) where 2^n - 3 is a prime. The only exception known till yet is 650 = 2 * 5^2 * 13.

  9. Ménage problem - Wikipedia

    en.wikipedia.org/wiki/Ménage_problem

    Therefore, the number of oriented Hamiltonian cycles in a crown graph is smaller by a factor of 2n than the number of seating arrangements, [5] but larger by a factor of (n − 1)! than the ménage numbers. The sequence of numbers of cycles in these graphs (as before, starting at n = 3) is 2, 12, 312, 9600, 416880, 23879520, 1749363840, ...

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