gistfile1.txt

PrimeGenerator: {
    return [idx] {
        .cache: .cache? || @

        cached: .cache(idx)
        return cached if cached

        max: .cache.last || 2

        is_prime: [n] {
            for x in range(2, Math.sqrt(n))
               for y in range(2, Math.sqrt(x))
                   return false if x*y = n
               end
            end
            return true
        }

        candidate: max + 1
        candidate +: 1 while not is_prime(candidate)
        .cache.set(idx, candidate)
        return candidate
    }
}

FirstPrime, SecondPrime, ThirdPrime: PrimeGenerator