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A020182
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Pseudoprimes to base 54.
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1
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55, 265, 341, 361, 385, 583, 781, 1045, 1105, 1247, 1729, 1855, 2201, 2465, 2701, 2821, 2863, 2915, 3445, 4033, 4069, 4081, 5005, 5317, 5461, 6095, 6601, 7471, 7957, 8321, 8911, 9073, 10585, 11713, 13357, 14585, 14701, 14905, 15409, 15841, 17755, 18721
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OFFSET
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1,1
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COMMENTS
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Composite numbers n such that 54^(n-1) == 1 (mod n). - Michel Lagneau, Feb 18 2012
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LINKS
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MATHEMATICA
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base = 54; t = {}; n = 1; While[Length[t] < 100, n++; If[! PrimeQ[n] && PowerMod[base, n-1, n] == 1, AppendTo[t, n]]]; t (* T. D. Noe, Feb 21 2012 *)
Select[Range[20000], !PrimeQ[#]&&PowerMod[54, #-1, #]==1&] (* Harvey P. Dale, Jul 03 2019 *)
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CROSSREFS
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Cf. A001567 (pseudoprimes to base 2).
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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