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2. 3 - Wikipedia

   en.wikipedia.org/wiki/3

   A natural number is divisible by three if the sum of its digits in base 10 is divisible by 3. For example, the number 21 is divisible by three (3 times 7) and the sum of its digits is 2 + 1 = 3. Because of this, the reverse of any number that is divisible by three (or indeed, any permutation of its digits) is also divisible by three. For ...

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 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.

5. The Penguin Dictionary of Curious and Interesting Numbers

   en.wikipedia.org/wiki/The_Penguin_Dictionary_of...

   The book includes some irrational numbers below 10 but concentrates on integers, and has an entry for every integer up to 42. The final entry is for Graham's number . In addition to the dictionary itself, the book includes a list of mathematicians in chronological sequence (all born before 1890), a short glossary , and a brief bibliography .

6. Category:3 (number) - Wikipedia

   en.wikipedia.org/wiki/Category:3_(number)

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

7. 83 (number) - Wikipedia

   en.wikipedia.org/wiki/83_(number)

   the 23rd prime number, following 79 (of which it is also a cousin prime) and preceding 89. a Sophie Germain prime. [1] a safe prime. [2] a Chen prime. [3] an Eisenstein prime with no imaginary part and real part of the form 3n − 1. a highly cototient number. [4] the number of primes that are right-truncatable. [5] a super-prime, because 23 is ...