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2000 (two thousand) is a natural number following 1999 and ... 2032 = number of binary Lyndon words of length 16 with an even number of ... 2997 – 1000-gonal number ...
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
The number 1000 is also sometimes ... writing "$30k" for $30 000 or denoting the Y2K computer bug of the year 2000. ... such that no two even numbers ...
The first 1000 prime numbers ... A cluster prime is a prime p such that every even natural number k ≤ p − 3 is the difference of two primes not exceeding p. 3, 5 ...
In British usage, this style is common for multiples of 100 between 1,000 and 2,000 (e.g. 1,500 as "fifteen hundred") but not for higher numbers. Americans may pronounce four-digit numbers with non-zero tens and ones as pairs of two-digit numbers without saying "hundred" and inserting "oh" for zero tens: "twenty-six fifty-nine" or "forty-one oh ...
A number where some but not all prime factors have multiplicity above 1 is neither square-free nor squareful. The Liouville function λ(n) is 1 if Ω(n) is even, and is -1 if Ω(n) is odd. The Möbius function μ(n) is 0 if n is not square-free. Otherwise μ(n) is 1 if Ω(n) is even, and is −1 if Ω(n) is odd.
A 19th-century gravestone in Llanfyllin, Wales, inscribed in the Theban script and an adaptation of Cistercian numerals; the year 1834 at bottom left is written with the four characters for 1000, 800, 30, and 4, rather than the single character for 1834. Horizontal numbers were the same, but rotated 90 degrees counter-clockwise.
The even numbers form an ideal in the ring of integers, [13] but the odd numbers do not—this is clear from the fact that the identity element for addition, zero, is an element of the even numbers only. An integer is even if it is congruent to 0 modulo this ideal, in other words if it is congruent to 0 modulo 2, and odd if it is congruent to 1 ...