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  2. Manhattan address algorithm - Wikipedia

    en.wikipedia.org/wiki/Manhattan_address_algorithm

    The nearest cross street to 78 Riverside Drive is West 80th Street. If you are at 501 5th Avenue , 501 ÷ 20 ≈ 25 {\displaystyle 501\div 20\approx 25} , then add the "tricky number" 18 {\displaystyle 18} to give 43 {\displaystyle 43} .

  3. 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.

  4. Table of divisors - Wikipedia

    en.wikipedia.org/wiki/Table_of_divisors

    d() is the number of positive divisors of n, including 1 and n itself; σ() is the sum of the positive divisors of n, including 1 and n itselfs() is the sum of the proper divisors of n, including 1 but not n itself; that is, s(n) = σ(n) − n

  5. Rounding - Wikipedia

    en.wikipedia.org/wiki/Rounding

    If it were not for the 0.5 fractional parts, the round-off errors introduced by the round to nearest method would be symmetric: for every fraction that gets rounded down (such as 0.268), there is a complementary fraction (namely, 0.732) that gets rounded up by the same amount.

  6. Orders of magnitude (frequency) - Wikipedia

    en.wikipedia.org/wiki/Orders_of_magnitude...

    100 PHz: 10 18: 1 exahertz (EHz) 10 19: 10 EHz: 10 20: 100 EHz: 300 EHz + Electromagnetic – gamma rays: 10 21: 1 zettahertz (ZHz) 36 ZHz: Resonance width of the rho meson: 10 24: 1 yottahertz (YHz) 10 27: 1 ronnahertz (RHz) 3.9 RHz: Highest energy (16 TeV) gamma ray detected, from Markarian 501: 10 30: 1 quettahertz (QHz) 10 43: 10 trillion ...

  7. 501 (number) - Wikipedia

    en.wikipedia.org/wiki/501_(number)

    501 (five hundred [and] one) is the natural number following 500 and preceding 502. 501 is the sum of the first eighteen primes . [ 1 ] There are 501 degree-8 polynomials with integer coefficients, all of whose roots are in the unit disk. [ 2 ]

  8. Order of magnitude - Wikipedia

    en.wikipedia.org/wiki/Order_of_magnitude

    An order-of-magnitude estimate of a variable, whose precise value is unknown, is an estimate rounded to the nearest power of ten. For example, an order-of-magnitude estimate for a variable between about 3 billion and 30 billion (such as the human population of the Earth) is 10 billion. To round a number to its nearest order of magnitude, one ...

  9. 34 (number) - Wikipedia

    en.wikipedia.org/wiki/34_(number)

    34 is the twelfth semiprime, [1] with four divisors including 1 and itself. Specifically, 34 is the ninth distinct semiprime , it being the sixth of the form 2 × q {\displaystyle 2\times q} . Its neighbors 33 and 35 are also distinct semiprimes with four divisors each, where 34 is the smallest number to be surrounded by numbers with the same ...