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In astronomy, NGC 881 is an Sc type galaxy in the constellation Cetus. [2] A bilingual play on words when text chatting in Mandarin Chinese or bilingually Mandarin Chinese and English. "881" is pronounced ba ba yi in Mandarin, and thus puns on "bye-bye." Probably an elaboration of the similar pun on "88" (ba-ba). See 88 (number). [citation needed]
From many countries, such as the U.K., U.S. toll-free numbers can be dialed, but the caller first gets a recorded announcement that the call is not free; in fact, on many carriers, the cost of calling a "toll-free" number can be higher than that of calling a normal number.
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.
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.
Area code 814 is one of the original North American area codes established in 1947. Its numbering plan area (NPA) is the largest in the state. It is the only one of Pennsylvania's original four NPAs that still has its original boundaries.
88 is: . a refactorable number. [1]a primitive semiperfect number. [2]an untouchable number. [3]a hexadecagonal number. [4]an Erdős–Woods number, since it is possible to find sequences of 88 consecutive integers such that each inner member shares a factor with either the first or the last member.
881 → : List of numbers ... is the natural number following 879 and preceding 881. Characteristics. In mathematics and sound. It is the number of 4-by-4 magic ...
Eighty-one is also: . The symbolic number of the Hells Angels Motorcycle Club. 'H' and 'A' are the 8th and 1st letter of the alphabet, respectively. [8]81 (八一) is referenced in flags and symbols of the People's Liberation Army as it was founded on August 1 (8/1).