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 A004626 #10 Oct 26 2023 00:45:42
%S A004626 1,3,9,11,19,27,33,43,57,59,67,81,83,99,107,121,129,131,139,163,171,
%T A004626 177,179,201,209,211,227,243,249,251,283,297,307,321,331,347,361,363,
%U A004626 379,387,393,417,419,443,467,473
%N A004626 Divisible only by primes congruent to 3 mod 8.
%H A004626 Vincenzo Librandi, <a href="/A004626/b004626.txt">Table of n, a(n) for n = 1..1000</a>
%t A004626 ok[1]=True;ok[n_]:=And@@(Mod[#,8]==3&)/@FactorInteger[n][[All,1]];Select[Range[3000],ok] (* _Vincenzo Librandi_, Aug 20 2012 *)
%o A004626 (Magma) [n: n in [1..1000] | forall{d: d in PrimeDivisors(n) | d mod 8 eq 3}]; // _Vincenzo Librandi_, Aug 20 2012
%K A004626 nonn
%O A004626 1,2
%A A004626 _N. J. A. Sloane_
%E A004626 Offset changed from 0 to 1 by _Vincenzo Librandi_, Aug 20 2012