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 A045381 #12 Sep 08 2022 08:44:55
%S A045381 2,7,23,29,37,43,71,79,107,113,127,149,163,191,197,211,233,239,281,
%T A045381 317,331,337,359,373,379,401,421,443,449,457,463,491,499,541,547,569,
%U A045381 617,631,653,659,673,701,709,743
%N A045381 Primes congruent to {0, 1, 2} mod 7.
%H A045381 Vincenzo Librandi, <a href="/A045381/b045381.txt">Table of n, a(n) for n = 1..1000</a>
%t A045381 Select[Prime[Range[300]],MemberQ[{0, 1, 2},Mod[#,7]]&] (* _Vincenzo Librandi_, Aug 11 2012 *)
%o A045381 (Magma) [p: p in PrimesUpTo(900) | p mod 7 in [0..2]]; // _Vincenzo Librandi_, Aug 11 2012
%Y A045381 Cf. A000040.
%K A045381 nonn,easy
%O A045381 1,1
%A A045381 _N. J. A. Sloane_