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  2. Electoral threshold - Wikipedia

    en.wikipedia.org/wiki/Electoral_threshold

    This led to a quarter of valid votes being wasted, on average and led to the 20 percent of the seats never being allocated due to the 3-seat cap [clarification needed] In 2007, the 2 percent threshold was altered to allow parties with less than 1 percent of first preferences to receive a seat each and the proportion of wasted votes reduced ...

  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. Party-list proportional representation - Wikipedia

    en.wikipedia.org/wiki/Party-list_proportional...

    Poster for the European Parliament election 2004 in Italy, showing party lists. Party-list proportional representation (list-PR) is a system of proportional representation based on preregistered political parties, with each party being allocated a certain number of seats roughly proportional to their share of the vote.

  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. 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 ...

  7. Talk:Betrothed numbers - Wikipedia

    en.wikipedia.org/wiki/Talk:Betrothed_numbers

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  8. 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.

  9. Amicable numbers - Wikipedia

    en.wikipedia.org/wiki/Amicable_numbers

    Sociable numbers are the numbers in cyclic lists of numbers (with a length greater than 2) where each number is the sum of the proper divisors of the preceding number. For example, 1264460 ↦ 1547860 ↦ 1727636 ↦ 1305184 ↦ 1264460 ↦ … {\displaystyle 1264460\mapsto 1547860\mapsto 1727636\mapsto 1305184\mapsto 1264460\mapsto \dots } are ...