A100142 - OEIS

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A100142

Numbers of prime primitive roots associated with A100141(n).

2, 2, 2, 3, 5, 7, 5, 3, 7, 7, 11, 13, 23, 19, 17, 29, 31, 23, 41, 29, 31, 41, 29, 47, 37, 43, 41, 71, 47, 79, 83, 89, 43, 83, 59, 73, 127, 83, 109, 67, 89, 101, 89, 89, 97, 107, 113, 151, 79, 79, 107, 113, 149, 157, 191, 193, 199, 113, 197, 191, 211, 113, 227, 131, 193, 241

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OFFSET

1,1

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..1000

MATHEMATICA

f[n_] := Module[{p = Select[PrimitiveRootList[n], PrimeQ], m}, m = Length[p]; If[MemberQ[p, m] && PrimeQ[m], m, 0]]; Select[f /@ Range[3000], # > 0 &] (* Amiram Eldar, Sep 25 2021 *)

CROSSREFS

Cf. A100141.

Sequence in context: A239470 A320786 A126111 * A296103 A247907 A122789

Adjacent sequences: A100139 A100140 A100141 * A100143 A100144 A100145

KEYWORD

easy,nonn

AUTHOR

Sven Simon, Nov 07 2004

EXTENSIONS

Offset corrected and a(2) inserted by Amiram Eldar, Sep 25 2021

STATUS

approved