A simple sieve in Phobos?

[bearophile]

safety0ff:

> I.E. Are there non-toy uses to support inclusion?

I have several non-toy uses for the GCD, binomial, and the 
permutations/combinations/pairwise ranges.

The other little discrete numerical functions like the integer 
square root, etc, are useful sufficiently often.

The other two (isPrime and a sieve) are less practical, so their 
inclusion is more debatable. Sometimes you want some small primes 
for hashing, or in the unittests of a Rational type, and few 
other situations. But D is for mathematics usage too. Given the 
commonality of prime numbers in discrete mathematics (example: if 
you want to study certain graphs), I think such two/three 
functions/generators are acceptable, if they aren't too much 
complex.

Bye,
bearophile