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 A074226 #24 Jan 14 2025 23:08:59
%S A074226 1,4,10,11,13,14,16,23,25,34,35,37,38,40,44,47,49,52,56,58,59,61,62,
%T A074226 64,71,73,82,83,85,86,92,95,97,100,106,107,109,110,119,121,130,131,
%U A074226 133,134,136,140,143,145,148,152,154,155,157,158,160,167,169,176,178,179
%N A074226 Numbers n such that Kronecker(3,n) = 1.
%C A074226 Numbers n such that Kronecker(3, n) = mu(gcd(n, 3)).
%H A074226 Indranil Ghosh, <a href="/A074226/b074226.txt">Table of n, a(n) for n = 1..1666</a>
%F A074226 a(n) seems to be asymptotic to c*n with c=3. - _Benoit Cloitre_, Sep 18 2002
%t A074226 Select[Range@ 180, KroneckerSymbol[3, #]== 1 &] (* _Indranil Ghosh_, Mar 16 2017 *)
%o A074226 (PARI) for (x=1,200, for (y=1,200,if (kronecker(x,y)==moebius(gcd(x,y)),write("km.txt",x,";",y," : ",kronecker(x,y)))))
%o A074226 (PARI) is(n)=kronecker(3,n)>0 \\ _Charles R Greathouse IV_, Apr 06 2012
%Y A074226 Cf. A074227, A047209, A074229.
%K A074226 nonn
%O A074226 1,2
%A A074226 _Jon Perry_, Sep 17 2002
%E A074226 Definition simplified by _Charles R Greathouse IV_, Apr 06 2012
%E A074226 Offset changed by _Sean A. Irvine_, Jan 14 2025