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 A167794 Numbers with primitive root 6. 20
 11, 13, 17, 41, 59, 61, 79, 83, 89, 103, 107, 109, 113, 121, 127, 131, 137, 151, 157, 169, 179, 199, 223, 227, 229, 233, 251, 257, 271, 277, 289, 347, 367, 373, 397, 401, 419, 443, 449, 467, 487, 491, 521, 563, 569, 587, 593, 613, 641, 659, 661, 683, 709, 733 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..1000 MAPLE A167794 := proc(n)     option remember;     if n =1 then         11;     else         for a from procname(n-1)+1 do             if numtheory[order](6, a) = numtheory[phi](a) then                 return a;             end if;         end do:     end if; end proc: seq(A167794(n), n=1..80) ; # R. J. Mathar, Sep 15 2021 MATHEMATICA pr=6; Select[Range[2, 2000], MultiplicativeOrder[pr, # ] == EulerPhi[ # ] &] CROSSREFS Cf. A019336 (primes with primitive root 6). Subseq. of A033948. Sequence in context: A032502 A209871 A347702 * A019336 A104070 A019371 Adjacent sequences:  A167791 A167792 A167793 * A167795 A167796 A167797 KEYWORD nonn AUTHOR T. D. Noe, Nov 12 2009 STATUS approved

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Last modified December 2 13:34 EST 2021. Contains 349444 sequences. (Running on oeis4.)