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 A143828 #10 Sep 08 2022 08:45:37
%S A143828 89,359,809,1439,4409,8999,10889,12959,20249,23039,35999,47609,51839,
%T A143828 56249,65609,75689,98009,116639,123209,129959,136889,143999,151289,
%U A143828 158759,166409,234089,272249,282239,302759,313289,334889,404009,416159
%N A143828 Primes of the form 10*k^2 - 1.
%H A143828 Vincenzo Librandi, <a href="/A143828/b143828.txt">Table of n, a(n) for n = 1..5000</a>
%t A143828 p = 10; a = {}; Do[k = p x^2 - 1; If[PrimeQ[k], AppendTo[a, k]], {x, 1, 1000}]; a
%t A143828 Select[Table[10n^2-1,{n,1,800}],PrimeQ] (* _Vincenzo Librandi_, Dec 07 2011 *)
%o A143828 (Magma) [a: n in [1..400] | IsPrime(a) where a is 10*n^2-1]; // _Vincenzo Librandi_, Dec 07 2011
%Y A143828 Cf. A066436, A066049, A090686, A090684, A143826, A143827.
%K A143828 nonn,easy
%O A143828 1,1
%A A143828 _Artur Jasinski_, Sep 02 2008