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A020166
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Pseudoprimes to base 38.
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1
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39, 65, 85, 91, 111, 185, 221, 259, 289, 469, 481, 561, 629, 697, 871, 1105, 1221, 1443, 1445, 2405, 2465, 2479, 2553, 2665, 2701, 2821, 3145, 3367, 3585, 3757, 4033, 4187, 4681, 5291, 5461, 6031, 6097, 6601, 6931, 7449, 7585, 7613, 7957, 8177, 9073, 9919
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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 38^(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 = 38; 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[10000], CompositeQ[#]&&PowerMod[38, #-1, #]==1&] (* Harvey P. Dale, Jan 22 2023 *)
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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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