Square-free Lucas -pseudoprimes and Carmichael-Lucas numbers
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.