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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.)