A019356 - OEIS

%I #19 Sep 23 2018 11:37:06

%S 11,23,41,43,47,59,61,79,89,109,131,151,167,173,179,193,197,199,251,

%T 263,281,293,307,317,349,383,419,421,433,439,449,457,491,503,521,523,

%U 541,557,569,577,641,647,653,659,673,677,743,751,761,773,787,797,809,829,863,881

%N Primes with primitive root 30.

%H Vincenzo Librandi, <a href="/A019356/b019356.txt">Table of n, a(n) for n = 1..1000</a>

%H <a href="/index/Pri#primes_root">Index entries for primes by primitive root</a>

%t Select[Prime[Range[200]], MultiplicativeOrder[30, #] == # - 1 &]

%t Join[{11,23},Select[Prime[Range[200]],PrimitiveRoot[#,30]==30&]] (* _Harvey P. Dale_, Sep 23 2018 *)

%K nonn,easy

%O 1,1

%A _David W. Wilson_