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 A141976 #11 Sep 08 2022 08:45:35
%S A141976 83,139,167,223,251,307,419,503,587,643,727,811,839,1063,1091,1231,
%T A141976 1259,1399,1427,1483,1511,1567,1847,1931,1987,2099,2239,2267,2351,
%U A141976 2659,2687,2939,3023,3079,3163,3191,3331,3359,3499,3527,3583,3779,3863,3919,3947
%N A141976 Primes congruent to 27 mod 28.
%H A141976 Vincenzo Librandi, <a href="/A141976/b141976.txt">Table of n, a(n) for n = 1..1000</a>
%F A141976 a(n) ~ 12n log n. - _Charles R Greathouse IV_, Jul 02 2016
%t A141976 Select[Prime[Range[1500]],MemberQ[{27},Mod[#,28]]&] (* _Vincenzo Librandi_, Aug 17 2012 *)
%t A141976 Select[Range[27,4000,28],PrimeQ] (* _Harvey P. Dale_, May 14 2016 *)
%o A141976 (Magma) [p: p in PrimesUpTo(5000) | p mod 28 eq 27 ]; // _Vincenzo Librandi_, Aug 17 2012
%o A141976 (PARI) is(n)=isprime(n) && n%28==27 \\ _Charles R Greathouse IV_, Jul 02 2016
%Y A141976 Cf. A000040.
%K A141976 nonn,easy
%O A141976 1,1
%A A141976 _N. J. A. Sloane_, Jul 11 2008