Right, in the first 100,000,000 digits of pi, we also have:    f(19) = 7072328. It’s a 5 ball ss 7942073892337571639    f(20) = 8629931. It’s a 4 ball ss 88131248833097026205    f(22) = 47994050. It’s a 5 ball ss 8006095353763383933888    f(24) = 8629931. It’s a 4 ball ss 881312488330970262053463

You’ll notice there are none for 21 or 23, and f(20)=f(24). I’ve checked up to period 60 and there are none higher than 24 (and only one of both 22 and 24). Guy—Guy