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A337830
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Odd integers k such that 6^((k-1)/2) + 1 == 0 (mod k*(k-1)/2).
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0
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2843, 2390123, 9893003, 16236347, 46353707, 334358459, 564092747, 584214107, 1640200619, 2010092603, 14044030043, 22315857803, 23753097803
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OFFSET
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1,1
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COMMENTS
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Computed terms are prime.
Conjecture: a(n) == 1 mod 406 for n > 5. - Chai Wah Wu, Oct 07 2020
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LINKS
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MATHEMATICA
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Select[Range[3, 10^7, 2], PowerMod[6, (# - 1)/2, (t = #*(# - 1)/2)] == t - 1 &] (* Amiram Eldar, Sep 24 2020 *)
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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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