public void FindMore()
{
List <int> candidates = new List <int>();
for (int index = 0; index < field; ++index)
{
var candidate = index + Offset;
bool found = false;
foreach (var prime in Primes)
{
if (candidate % prime == 0)
{
found = true;
break;
}
}
if (!found)
{
candidates.Add(candidate);
}
}
Primes.AddRange(candidates);
Offset += field;
}