(UK politics, colloquial) Synonym of 11 Downing Street

An alphanumeric code representing a general class of ballad.

(UK politics, colloquial) Synonym of 11 Downing Street

(mathematics, number theory) Any natural number n for which, for some positive integer k, n = 1 + k(σ(n) - n - 1), where σ(n) is the sum of the positive divisors of n.

A squarefree integer with at least three prime factors which fall into the pattern p_x=ap_x-1+b, where a and b are some integer constants and x is the index number of each prime factor in the factorization, sorted from lowest to highest.

A number of the form xʸ+yˣ, where x and y are integers greater than 1.

(number theory) An irrational number x with the property that, for every positive integer n, there exist integers p and q with q > 1 and such that 0<|x-p/q|<1/(qⁿ).

plural of algebraic number field

The smallest number bigger than any finite number named by an expression in the language of set theory with a googol symbols or less.

Which, what position (in an ordered series, such as which day of the month or which floor). (This entry is a translation hub.)