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A285549
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Smallest weak pseudoprime to all natural bases up to prime(n) that is not a Carmichael number.
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7
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341, 2701, 721801, 721801, 42702661, 1112103541, 2380603501, 5202153001, 17231383261, 251994268081, 1729579597021, 55181730338101, 142621888086541, 242017633321201, 242017633321201, 242017633321201, 1174858593838021, 1174858593838021, 168562580058457201, 790489610041255741, 790489610041255741, 790489610041255741
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OFFSET
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1,1
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COMMENTS
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a(n) is the smallest composite k such that p^k == p (mod k) for every prime p <= A000040(n) and A002322(k) does not divide k-1.
If a composite m < a(n) and p^m == p (mod m) for every prime p <= prime(n), then m is a Carmichael number.
Except a(19), the listed terms are semiprime. - Thomas Ordowski, Feb 09 2018
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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