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 A142466 #13 Jul 24 2023 09:56:11
%S A142466 127,227,277,577,677,727,827,877,977,1277,1327,1427,1627,1777,1877,
%T A142466 2027,2377,2477,2677,2777,2927,3527,3677,3727,3877,4027,4127,4177,
%U A142466 4327,4877,5077,5227,5477,5527,5827,5927,6277,6427,6577,6827,6977,7027,7127,7177
%N A142466 Primes congruent to 27 mod 50.
%H A142466 Vincenzo Librandi, <a href="/A142466/b142466.txt">Table of n, a(n) for n = 1..1000</a>
%F A142466 a(n) ~ 20n log n. - _Charles R Greathouse IV_, Jul 03 2016
%t A142466 Select[Prime[Range[1000]], MemberQ[{27}, Mod[#, 50]] &] (* _Vincenzo Librandi_, Aug 28 2012 *)
%t A142466 Select[Range[27,7200,50],PrimeQ] (* _Harvey P. Dale_, Apr 08 2018 *)
%o A142466 (Magma) [p: p in PrimesUpTo(8000) | p mod 50 eq 27]; // _Vincenzo Librandi_, Aug 28 2012
%o A142466 (PARI) is(n)=isprime(n) && n%50==27 \\ _Charles R Greathouse IV_, Jul 03 2016
%Y A142466 Cf. A000040, A141928.
%K A142466 nonn,easy
%O A142466 1,1
%A A142466 _N. J. A. Sloane_, Jul 11 2008