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A069042
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Numbers n such that the n-th Euler number (A000364) == 1 (mod n^2).
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1
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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Select[Range[2, 10000], Divisible[Abs[EulerE[2*#]] - 1, #^2] &] (* Amiram Eldar, Jun 03 2017 *)
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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