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Let be a fixed positive integer. A Lucas -pseudoprime is a Lucas pseudoprime for which there exists a Lucas sequence such that the rank of in is exactly , where is the signature of . We prove here that all but a finite number of Lucas -pseudoprimes are square free. We also prove that all but a finite number of Lucas -pseudoprimes are Carmichael-Lucas numbers.
We prove that every Sturmian word ω has infinitely many prefixes of
the form UnVn3, where |Un| < 2.855|Vn| and
limn→∞|Vn| = ∞. In passing, we give a very simple proof of the
known fact that every Sturmian word begins in arbitrarily long squares.
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