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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. Subsets of the prime numbers may be generated with various formulas for primes.

3. List of numbers - Wikipedia, the free encyclopedia

   en.wikipedia.org/wiki/List_of_numbers

   A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.

4. List of Dewey Decimal classes - Wikipedia

   en.wikipedia.org/wiki/List_of_Dewey_Decimal_classes

   The Dewey Decimal Classification (DDC) is structured around ten main classes covering the entire world of knowledge; each main class is further structured into ten hierarchical divisions, each having ten divisions of increasing specificity. [1] As a system of library classification the DDC is "arranged by discipline, not subject", so a topic ...

5. International Phonetic Alphabet chart - Wikipedia

   en.wikipedia.org/wiki/International_Phonetic...

   For the distinction between [ ], / / and , see IPA § Brackets and transcription delimiters. The following is the chart of the International Phonetic Alphabet, a standardized system of phonetic symbols devised and maintained by the International Phonetic Association. It is not a complete list of all possible speech sounds in the world's ...

6. List of Mersenne primes and perfect numbers - Wikipedia

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

   Thus, all Mersenne numbers M4k+1 are congruent to 11 modulo 20 and end in 11, 31, 51, 71 or 91, while Mersenne numbers M4k−1 ≡ 7 (mod 20) and end in 07, 27, 47, 67, or 87. For the perfect numbers, define Pn = 2n−1Mn be the value which is perfect if Mn is prime. When n = 4k+1 and k > 0, 24k ≡ 16 (mod 20), so Pn ≡ 16×11 ≡ 16 (mod 20 ...

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8. Table of prime factors - Wikipedia

   en.wikipedia.org/wiki/Table_of_prime_factors

   A factorial x! is the product of all numbers from 1 to x. The first: 1, 2, 6, 24, 120, 720, 5040, 40320, 362880, 3628800, 39916800, 479001600 (sequence A000142 in the OEIS). 0! = 1 is sometimes included. A k-smooth number (for a natural number k) has its prime factors ≤ k (so it is also j-smooth for any j > k).

9. English numerals - Wikipedia

   en.wikipedia.org/wiki/English_numerals

   10,000: a myriad (a hundred hundred), commonly used in the sense of an indefinite very high number. 100,000: a lakh (a hundred thousand), in Indian English. 10,000,000: a crore (a hundred lakh), in Indian English and written as 100,00,000. 10 100: googol (1 followed by 100 zeros), used in mathematics.