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Infinitely many weird numbers exist. [3] For example, 70p is weird for all primes p ≥ 149. In fact, the set of weird numbers has positive asymptotic density. [4] It is not known if any odd weird numbers exist. If so, they must be greater than 10 21. [5] Sidney Kravitz has shown that for k a positive integer, Q a prime exceeding 2 k, and
Even and odd numbers have opposite parities, e.g., 22 (even number) and 13 (odd number) have opposite parities. In particular, the parity of zero is even. [2] Any two consecutive integers have opposite parity. A number (i.e., integer) expressed in the decimal numeral system is even or odd according to whether its last digit is even or odd. That ...
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.
An abundant number which is not a semiperfect number is called a weird number. [6] An abundant number with abundance 1 is called a quasiperfect number, although none have yet been found. Every abundant number is a multiple of either a perfect number or a primitive abundant number.
From fascinating bite-size tidbits about science, to celebrities, history, and the plain weird and bizarre. The “Today I Learned” (TIL) page is a go-to corner of the internet, where a whopping ...
To help you get started, Parade rounded up 135 remarkable facts. We broke them up into sections for adults and kids, however, don’t let that keep you from reading both lists.
Image credits: factz.unheard “The lower atmosphere in particular has so many different conditions based on altitude yet the general public assumes its all relatively the same behavior no matter ...
Demonstration, with Cuisenaire rods, that the number 10 is an unusual number, its largest prime factor being 5, which is greater than √10 ≈ 3.16 In number theory , an unusual number is a natural number n whose largest prime factor is strictly greater than n {\displaystyle {\sqrt {n}}} .
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