# Viggo Brun

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**Viggo Brun** (October 13, 1882 - August 15, 1978) was a Norwegian mathematician. He was born in Lier and died in Drøbak.

His best known contribution is that he showed that the sum of reciprocals of twin primes converges to a finite value, now called Brun's constant. He proved that by means of devising an improvement over Legendre's version the sieve of Eratosthenes, now known as the *Brun sieve*. Because of this, he is widely considered one of the founders of modern sieve theory.

## External links

- Brun's Constant: http://planetmath.org/encyclopedia/BrunsConstant.html
- Brun's Pure Sieve: http://planetmath.org/encyclopedia/BrunsPureSieve.html