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 A167802 Numbers with primitive root -6. 19
 13, 17, 19, 23, 41, 47, 61, 67, 71, 89, 109, 113, 137, 157, 167, 169, 211, 229, 233, 257, 263, 277, 283, 289, 331, 359, 361, 373, 383, 397, 401, 449, 479, 503, 521, 523, 529, 547, 569, 593, 599, 613, 619, 641, 647, 661, 691, 709, 719, 733, 739, 743, 757, 761 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 MATHEMATICA pr=-6; Select[Range[2, 2000], MultiplicativeOrder[pr, # ] == EulerPhi[ # ] &] PROG (PARI) is(n)=gcd(n, 6)==1 && znorder(Mod(-6, n))==eulerphi(n) && n>1 \\ Charles R Greathouse IV, Feb 23 2017 CROSSREFS Cf. A105878 (primes with primitive root -6) Sequence in context: A214033 A268593 A175873 * A105878 A054476 A319504 Adjacent sequences:  A167799 A167800 A167801 * A167803 A167804 A167805 KEYWORD nonn AUTHOR T. D. Noe, Nov 12 2009 STATUS approved

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Last modified April 22 14:33 EDT 2021. Contains 343177 sequences. (Running on oeis4.)