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A167806
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Numbers with primitive root -10.
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20
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3, 17, 29, 31, 43, 61, 67, 71, 83, 97, 107, 109, 113, 149, 151, 163, 181, 191, 193, 199, 227, 229, 233, 257, 269, 283, 289, 307, 311, 313, 337, 347, 359, 389, 431, 433, 439, 443, 461, 467, 479, 509, 523, 541, 563, 577, 587, 593, 599, 631, 683, 701, 709, 719
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OFFSET
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1,1
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COMMENTS
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LINKS
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MATHEMATICA
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pr=-10; Select[Range[2, 2000], MultiplicativeOrder[pr, # ] == EulerPhi[ # ] &]
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PROG
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(PARI) is(n)=if(gcd(n, 10)>1, return(0)); my(p=eulerphi(n)); znorder(Mod(-10, n), p)==p \\ Charles R Greathouse IV, Nov 25 2014
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CROSSREFS
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Cf. A007348 (primes with primitive root -10).
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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