Random Question about Catagolue

[Inferno]

I'm curious to know, what is the lowest oscillator period in any rule that hasn't turned up yet? I don't know how to check that, but it would be interesting to see what periods are unknown.

[yujh]

Lowest period oscillator? I assume p2 for non generation rules?

[hotdogPi]

I think Inferno is asking about the lowest period that doesn't exist all across Catagolue. The numbers up to 16 are all covered by Life in various symmetries. 17 almost certainly exists in some other rule. The question is the lowest number that doesn't appear in any rule.