This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A167796 #7 Jan 04 2025 00:35:56 %S A167796 3,5,11,25,29,53,59,83,101,107,121,125,131,149,173,179,197,227,269, %T A167796 293,317,347,389,419,443,461,467,491,509,557,563,587,625,653,659,677, %U A167796 701,773,797,821,827,841,941,947,1019,1061,1091,1109,1187,1229,1259,1277 %N A167796 Numbers with primitive root 8. %H A167796 Vincenzo Librandi, <a href="/A167796/b167796.txt">Table of n, a(n) for n = 1..1000</a> %t A167796 pr=8; Select[Range[2,2000], MultiplicativeOrder[pr,# ] == EulerPhi[ # ] &] %o A167796 (PARI) is(n)=if(n%2==0, return(0)); my(p=eulerphi(n)); znorder(Mod(8, n), p)==p \\ _Charles R Greathouse IV_, Jan 04 2025 %Y A167796 Cf. A019338 (primes with primitive root 8) %K A167796 nonn %O A167796 1,1 %A A167796 _T. D. Noe_, Nov 12 2009