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A292571
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Lucas-Carmichael numbers whose Dedekind psi value is a square.
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3
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935, 31535, 76751, 1707839, 3106799, 11141999, 24685199, 43383167, 83618639, 151524071, 161841239, 189099039, 212133599, 213884999, 219155615, 233743319, 241485839, 271038599, 287432495, 338340239, 353107799, 624840479, 660423455, 945236159, 1171355471
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OFFSET
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1,1
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LINKS
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EXAMPLE
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psi(935) = 36^2.
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MATHEMATICA
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psi[n_] := If[n < 1, 0, n*Sum[MoebiusMu[d]^2/d, {d, Divisors@n}]]; s = Import["b006972.txt", "Data"][[All, -1]]; Select[s, IntegerQ@Sqrt[psi@#] &]
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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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