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 A141927 #13 Sep 08 2022 08:45:35
%S A141927 101,151,251,401,601,701,751,1051,1151,1201,1301,1451,1601,1801,1901,
%T A141927 1951,2251,2351,2551,2801,2851,3001,3251,3301,3701,3851,4001,4051,
%U A141927 4201,4451,4651,4751,4801,4951,5051,5101,5351,5501,5651,5701,5801,5851,6101,6151
%N A141927 Primes congruent to 1 mod 25.
%H A141927 Vincenzo Librandi, <a href="/A141927/b141927.txt">Table of n, a(n) for n = 1..1000</a>
%F A141927 a(n) ~ 20n log n. - _Charles R Greathouse IV_, Jul 02 2016
%t A141927 Select[Prime[Range[900]], MemberQ[{1}, Mod[#, 25]] &] (* _Vincenzo Librandi_, Aug 16 2012 *)
%t A141927 Select[Range[1,6200,25],PrimeQ] (* _Harvey P. Dale_, Oct 02 2016 *)
%o A141927 (Magma) [p: p in PrimesUpTo(8000) | p mod 25 eq 1 ]; // _Vincenzo Librandi_, Aug 16 2012
%o A141927 (PARI) is(n)=isprime(n) && n%25==1 \\ _Charles R Greathouse IV_, Jul 02 2016
%Y A141927 Cf. A000040.
%K A141927 nonn,easy
%O A141927 1,1
%A A141927 _N. J. A. Sloane_, Jul 11 2008