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 A144233 #15 Jul 24 2025 03:25:58
%S A144233 29,3121,15629,78121,9765629,30517578121,
%T A144233 710542735760100185871124267578121,
%U A144233 413590306276513837435704346034981426782906055450439453121,197215226305252951352932141320696557418301608777255751192569732666015629
%N A144233 Prime numbers of the form 5^k +- 4 for k >= 1.
%H A144233 Amiram Eldar, <a href="/A144233/b144233.txt">Table of n, a(n) for n = 1..15</a>
%t A144233 Select[Flatten[Table[5^n+{-4,4},{n,90}]],PrimeQ] (* _Harvey P. Dale_, Jan 26 2019 *)
%Y A144233 Cf. A000040, A000668, A144231, A144232.
%K A144233 nonn
%O A144233 1,1
%A A144233 _Reikku Kulon_, Sep 15 2008
%E A144233 More terms from _Alois P. Heinz_, Jul 14 2019