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  2. List of countries by rate of natural increase - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by_rate...

    The birth rates [1] and death rates [2] in columns one and two are the CIA World Factbook estimates for the year 2022 unless otherwise noted, rounded to the nearest tenth (except for Mayotte and the Falkland Islands with 2010 and 2012 estimates respectively).

  3. Division (mathematics) - Wikipedia

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

    In terms of partition, 20 / 5 means the size of each of 5 parts into which a set of size 20 is divided. For example, 20 apples divide into five groups of four apples, meaning that "twenty divided by five is equal to four". This is denoted as 20 / 5 = 4, or ⁠ 20 / 5 ⁠ = 4. [2] In the example, 20 is the dividend, 5 is the divisor, and 4 is ...

  4. Divisibility rule - Wikipedia

    en.wikipedia.org/wiki/Divisibility_rule

    Answer: 7 × 1 + 6 × 10 + 5 × 9 + 4 × 12 + 3 × 3 + 2 × 4 + 1 × 1 = 178 mod 13 = 9 Remainder = 9 A recursive method can be derived using the fact that = and that =. This implies that a number is divisible by 13 iff removing the first digit and subtracting 3 times that digit from the new first digit yields a number divisible by 13.

  5. Division by zero - Wikipedia

    en.wikipedia.org/wiki/Division_by_zero

    For example, using single-precision IEEE arithmetic, if x = −2 −149, then x/2 underflows to −0, and dividing 1 by this result produces 1/(x/2) = −∞. The exact result −2 150 is too large to represent as a single-precision number, so an infinity of the same sign is used instead to indicate overflow.

  6. Perfect number - Wikipedia

    en.wikipedia.org/wiki/Perfect_number

    Illustration of the perfect number status of the number 6. In number theory, a perfect number is a positive integer that is equal to the sum of its positive proper divisors, that is, divisors excluding the number itself. For instance, 6 has proper divisors 1, 2 and 3, and 1 + 2 + 3 = 6, so 6 is a perfect number.

  7. List of countries by number of scientific and technical ...

    en.wikipedia.org/wiki/List_of_countries_by...

    The "share" is lower than the count because for each article it is based on the number of nationals who have contributed, divided by the total number of contributors. In many cases the "share" will be much lower than the "count" because the "count" includes articles published by institutions which may have only a very few members of the ...

  8. 6 - Wikipedia

    en.wikipedia.org/wiki/6

    The smallest non-abelian group is the symmetric group which has 3! = 6 elements. [1] 6 the answer to the two-dimensional kissing number problem. [15] A regular cube, with six faces. A cube has 6 faces. A tetrahedron has 6 edges. In four dimensions, there are a total of six convex regular polytopes.

  9. List of integer sequences - Wikipedia

    en.wikipedia.org/wiki/List_of_integer_sequences

    0, 1, 3, 6, 2, 7, 13, 20, 12, 21, 11, 22, 10, 23, 9, 24, 8, 25, 43, 62, ... "subtract if possible, otherwise add" : a (0) = 0; for n > 0, a ( n ) = a ( n − 1) − n if that number is positive and not already in the sequence, otherwise a ( n ) = a ( n − 1) + n , whether or not that number is already in the sequence.