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  2. List of prime numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_prime_numbers

    This is a list of articles about prime numbers.A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself. By Euclid's theorem, there are an infinite number of prime numbers.

  3. 11 (number) - Wikipedia

    en.wikipedia.org/wiki/11_(number)

    11 is the second member of the second pair (5, 11) of Brown numbers. Only three such pairs of numbers and where are known; the largest pair (7, 71) satisfies . In this last pair, the factorial of 7 = 5040 is divisible by all integers less than 13, with the exception of 11. More consequentially, 5 is the fifth Heegner number, meaning that the ...

  4. List of country calling codes - Wikipedia

    en.wikipedia.org/wiki/List_of_country_calling_codes

    Zone 5 uses eight 2-digit codes (51–58) and two sets of 3-digit codes (50x, 59x) to serve South and Central America. Zone 6 uses seven 2-digit codes (60–66) and three sets of 3-digit codes (67x–69x) to serve Southeast Asia and Oceania. Zone 7 uses an integrated numbering plan; two digits (7x) determine the area served: Russia or Kazakhstan.

  5. Truncatable prime - Wikipedia

    en.wikipedia.org/wiki/Truncatable_prime

    Truncatable prime. In number theory, a left-truncatable prime is a prime number which, in a given base, contains no 0, and if the leading ("left") digit is successively removed, then all resulting numbers are prime. For example, 9137, since 9137, 137, 37 and 7 are all prime. Decimal representation is often assumed and always used in this article.

  6. List of mathematical constants - Wikipedia

    en.wikipedia.org/wiki/List_of_mathematical_constants

    Name Symbol Decimal expansion Formula Year Set One: 1 1 Prehistory Two: 2 2 Prehistory One half: 1/2 0.5 Prehistory Pi: 3.14159 26535 89793 23846 [Mw 1] [OEIS 1]: Ratio of a circle's circumference to its diameter.

  7. Mathematics education in the United States - Wikipedia

    en.wikipedia.org/wiki/Mathematics_education_in...

    e. Mathematics education in the United States varies considerably from one state to the next, and even within a single state. However, with the adoption of the Common Core Standards in most states and the District of Columbia beginning in 2010, mathematics content across the country has moved into closer agreement for each grade level.

  8. List of Mersenne primes and perfect numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_Mersenne_primes...

    For example, 3 is a Mersenne prime as it is a prime number and is expressible as 22 − 1. [ 1][ 2] The numbers p corresponding to Mersenne primes must themselves be prime, although not all primes p lead to Mersenne primes—for example, 211 − 1 = 2047 = 23 × 89. [ 3] Meanwhile, perfect numbers are natural numbers that equal the sum of their ...

  9. Combinatorial number system - Wikipedia

    en.wikipedia.org/wiki/Combinatorial_number_system

    The main purpose of the combinatorial number system is to provide a representation, each by a single number, of all possible k -combinations of a set S of n elements. Choosing, for any n, {0, 1, ..., n − 1 } as such a set, it can be arranged that the representation of a given k -combination C is independent of the value of n (although n must ...

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