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2. Table of prime factors - Wikipedia

   en.wikipedia.org/wiki/Table_of_prime_factors

   An economical number has been defined as a frugal number, but also as a number that is either frugal or equidigital. gcd( m , n ) ( greatest common divisor of m and n ) is the product of all prime factors which are both in m and n (with the smallest multiplicity for m and n ).

3. List of prime numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_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 .

4. Toll-free telephone numbers in the North American Numbering ...

   en.wikipedia.org/wiki/Toll-free_telephone...

   Toll-free telephone numbers in the North American Numbering Plan have the area code prefix 800, 833, 844, 855, 866, 877, or 888. Additionally, area codes 822, 880 through 887, and 889 are reserved for toll-free use in the future. 811 is excluded because it is a special dialing code in the group NXX for various other purposes.

5. List of types of numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_types_of_numbers

   Such a number is algebraic and can be expressed as the sum of a rational number and the square root of a rational number. Constructible number: A number representing a length that can be constructed using a compass and straightedge. Constructible numbers form a subfield of the field of algebraic numbers, and include the quadratic surds.

6. 877 (number) - Wikipedia

   en.wikipedia.org/?title=877_(number)&redirect=no

   From Wikipedia, the free encyclopedia. Redirect page. Redirect to:

7. Names of small numbers - Wikipedia

   en.wikipedia.org/wiki/Names_of_small_numbers

   Printable version; In other projects ... You can help by providing page numbers for existing citations. ... 1: One: 10 −1: 100×10 −3: One Tenth: deci-d:

8. 87 (number) - Wikipedia

   en.wikipedia.org/wiki/87_(number)

   The opus number of the 24 Preludes and Fugues of Dmitri Shostakovich. In model railroading, the ratio of the popular H0 scale is 1:87. [6] Proto:87 scale claims to offer precise proportions of wheels and tracks of real railroads. 87 is by far the most commonly used octane rating of gasoline in the United States, Canada, Australia, and New Zealand.

9. 800 (number) - Wikipedia

   en.wikipedia.org/wiki/800_(number)

   840 = 2 3 × 3 × 5 × 7, highly composite number, [34] smallest number divisible by the numbers 1 to 8 (lowest common multiple of 1 to 8), sparsely totient number, [35] Harshad number in base 2 through base 10, idoneal number, balanced number, [36] sum of a twin prime (419 + 421).