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A263239
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Euler pseudoprimes to base 9: composite integers such that abs(9^((n - 1)/2)) == 1 mod n.
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1
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4, 28, 91, 121, 286, 532, 671, 703, 949, 1036, 1105, 1541, 1729, 1891, 2465, 2665, 2701, 2821, 3281, 3367, 3751, 4636, 4961, 5551, 6364, 6601, 7381, 8401, 8911, 10585, 11011, 11476, 12403, 14383, 15203, 15457, 15841, 16471, 16531, 18721, 19345, 19684, 23521, 24046, 24661, 24727
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OFFSET
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1,1
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COMMENTS
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LINKS
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MATHEMATICA
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eulerPseudo9Q[n_]:=(Mod[9^((n-1)/2)+1, n]==0 ||Mod[9^((n-1)/2)-1, n]==0) && Not[PrimeQ[n]];
Select[Range[2, 200000], eulerPseudo9Q]
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PROG
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CROSSREFS
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Cf. A020138 (pseudoprimes to base 9).
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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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