King Arthur's knights

There are p knights sitting at positions [1,2,...p][1, 2, ... p] at King Arthur's round table. In order to choose the leader, Arthur starts counting at position 1 and dismisses every rth seated knight until only 1 knight remains. The remaining seated knight becomes the leader.

Let C(p,r)C(p, r) be the integer position of the eventual leader when the table starts out with p knights and every rth seated one is dismissed.

Let T = C(999,11)+C(121,12)+C(2,1)+C(15,16)+C(99,3)C(999,11) + C(121, 12) + C(2, 1) + C(15, 16) + C(99, 3). What is T?

Details and assumptions

C(4,2)=1C(4, 2) = 1. The knights start seated at positions 1, 2, 3, 4. Arthur dismisses them in this order: 2, 4, 3. The knight seated at position 1 becomes the leader.

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