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A294028
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Composite numbers k such that k | 1 - A078712(k).
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1
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49, 77, 121, 203, 319, 413, 679, 721, 749, 841, 869, 1057, 1211, 1351, 1393, 1397, 1441, 1639, 1687, 1757, 1769, 1883, 2167, 2189, 2219, 2359, 2429, 2581, 2651, 2761, 2959, 3031, 3073, 3101, 3227, 3409, 3437, 3485, 3487, 3563, 3899, 4037, 4039, 4109, 4279
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OFFSET
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1,1
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COMMENTS
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A018187 (restricted Perrin pseudoprimes) is the intersection of A013998 (unrestricted Perrin pseudoprimes) with this sequence.
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LINKS
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MATHEMATICA
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a={}; b=-Drop[CoefficientList[Series[(2x+3)/(x^3-x-1), {x, 0, 10^4}], x] , 1];
Do[If[!PrimeQ[k]&&Divisible[b[[k]]+1, k], AppendTo[a, k]], {k, 2, Length[b]}]; a
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CROSSREFS
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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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