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A123693
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Primes p such that p^2 divides 7^(p-1) - 1.
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25
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OFFSET
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1,1
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COMMENTS
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Dorais and Klyve proved that there are no further terms up to 9.7*10^14.
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LINKS
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MATHEMATICA
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Select[Prime[Range[1000000]], PowerMod[7, # - 1, #^2] == 1 &] (* Robert Price, May 17 2019 *)
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CROSSREFS
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KEYWORD
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bref,hard,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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