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26 is the smallest even number n such that both n + 1 and n − 1 are composite. With an aliquot sum of 16 , within an aliquot sequence of five composite numbers (26, 16 , 15 , 9 , 4 , 3 , 1 ,0) to the Prime in the 3 -aliquot tree.
A list of articles about numbers (not about numerals). Topics include powers of ten, notable integers, prime and cardinal numbers, and the myriad system.
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.
2.26.1 (p, p − 3) irregular primes. 2.26.2 ... A prime number (or prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself.
The Natural Area Code, this is the smallest base such that all of 1 / 2 to 1 / 6 terminate, a number n is a regular number if and only if 1 / n terminates in base 30. 32: Duotrigesimal: Found in the Ngiti language. 33: Use of letters (except I, O, Q) with digits in vehicle registration plates of Hong Kong. 34
A number that has the same number of digits as the number of digits in its prime factorization, including exponents but excluding exponents equal to 1. A046758 Extravagant numbers
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All numbers above 1 are either prime or composite. 1 is neither. A semiprime has Ω(n) = 2 ... 12, 18, 20, 22, 24, 26, 28, 30 (sequence A046760 in the OEIS).