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  2. 81 (number) - Wikipedia

    en.wikipedia.org/wiki/81_(number)

    81 is: the square of 9 and the second fourth-power of a prime; 3 4. with an aliquot sum of 40; within an aliquot sequence of three composite numbers (81,40,50,43,1,0) to the Prime in the 43-aliquot tree. a perfect totient number like all powers of three. [1] a heptagonal number. [2] an icosioctagonal number. [3] a centered octagonal number. [4 ...

  3. Table of prime factors - Wikipedia

    en.wikipedia.org/wiki/Table_of_prime_factors

    m is a divisor of n (also called m divides n, or n is divisible by m) if all prime factors of m have at least the same multiplicity in n. The divisors of n are all products of some or all prime factors of n (including the empty product 1 of no prime factors). The number of divisors can be computed by increasing all multiplicities by 1 and then ...

  4. 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.

  5. Prime number - Wikipedia

    en.wikipedia.org/wiki/Prime_number

    The same prime factor may occur more than once; this example has two copies of the prime factor When a prime occurs multiple times, exponentiation can be used to group together multiple copies of the same prime number: for example, in the second way of writing the product above, 5 2 {\displaystyle 5^{2}} denotes the square or second power of 5 ...

  6. Composite number - Wikipedia

    en.wikipedia.org/wiki/Composite_number

    If none of its prime factors are repeated, it is called squarefree. (All prime numbers and 1 are squarefree.) For example, 72 = 2 3 × 3 2, all the prime factors are repeated, so 72 is a powerful number. 42 = 2 × 3 × 7, none of the prime factors are repeated, so 42 is squarefree. Euler diagram of numbers under 100:

  7. Mortgage and refinance rates for Jan. 16, 2025: Rates hit ...

    www.aol.com/finance/mortgage-and-refinance-rates...

    7.81%. 30-year fixed jumbo rate. 7.15%. Source: Bankrate lender survey. Mortgage rates are determined by many factors that include inflation rates, economic conditions, housing market trends and ...

  8. Southbound I-81 remains mostly closed in Md. near W.Va ... - AOL

    www.aol.com/crash-paint-spill-closes-81...

    One lane of southbound I-81 had just reopened following a closure since 3:30 a.m. due to a truck crash and hazmat spill. Fish in piranha family caught: Maryland man catches invasive fish with ...

  9. Virgin Australia Airline crew allegedly sexually assaulted ...

    www.aol.com/news/airline-crew-reportedly-virgin...

    Virgin Australia crew members were allegedly sexually assaulted and robbed in one of Fiji's nightclub areas on New Year's Day, the island country's Deputy Prime Minister Viliame Gavoka announced.