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Okay, is it Lucifer? I've never read it.
For the swans, mathematics was never my thing, but we must be talking about 11, 17, 23, 29, 41, 47, and now I am running out of fingers and toes. But from your clue, n should be 1 and so the answer is 11.
PS. Even if either answer is right, someone else should have a go at the next quiz. Shayne?
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