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A081764
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Primes p such that p*(p-2) divides 3^(p-1)-1.
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1
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37, 457, 1297, 2557, 4357, 6481, 8689, 11953, 14401, 26497, 33931, 44101, 47521, 47881, 90631, 141157, 157081, 165601, 206221, 225457, 304081, 366097, 384049, 427351, 446881, 560737, 576721, 589591, 636781, 677041, 1037857, 1046641, 1049941, 1079569
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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[Prime[Range[85000]], PowerMod[3, #-1, #(#-2)]==1&]//Quiet (* Harvey P. Dale, Mar 19 2019 *)
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PROG
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(PARI) lista(nn) = {forprime(p=3, nn, if (! ((3^(p-1)-1) % (p*(p-2))), print1(p, ", ")); ); }
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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