A surname.

(number theory) The finite value, denoted by B₂, to which the sum of the reciprocals of the twin primes converge, according to Brun's theorem.

(number theory) A theorem stating that the sum of the reciprocals of the twin primes converges to a finite value (Brun's constant).

(number theory) A technique for estimating the size of sifted sets of positive integers that satisfy a set of conditions expressed by congruences.

plural of Brun sieve