Double factorial and primorial

[Niels Möller]

bodrato at mail.dm.unipi.it writes:

> It is hard to decide what a public interface should give as a result:
> a list of primes?

The simplest and *general* interface I can come up with takes a range as
input, and a callback function. And then that callback function is
invoked for each prime in the interval. Could perhaps also return the
number of primes in the interval, and allow a NULL callback.

Regards,
/Niels

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