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Numbers k such that x^k + x^2 + 1 is irreducible over GF(7).

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`%I #11 Sep 09 2022 23:36:57
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`%S 3,6,9,18,65,66,287,354
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`%N Numbers k such that x^k + x^2 + 1 is irreducible over GF(7).
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`%Y Cf. A057460, A058857.
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`%K nonn
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`%O 1,1
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`%A _Robert G. Wilson v_, Jan 16 2001
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