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 A144242 #13 Jul 24 2025 03:26:12
%S A144242 71,262151,1073741831,549755813881,302231454903657293676551,
%T A144242 85070591730234615865843651857942052871,
%U A144242 23945242826029513411849172299223580994042798784118791,25711008708143844408671393477458601640355247900524685364822023
%N A144242 Prime numbers of the form 8^k +- 7.
%H A144242 Amiram Eldar, <a href="/A144242/b144242.txt">Table of n, a(n) for n = 1..14</a>
%t A144242 Select[Sort[Flatten[Table[8^k+{7,-7},{k,90}]]],PrimeQ] (* _Harvey P. Dale_, Aug 08 2016 *)
%Y A144242 Cf. A000040, A000668, A104066, A144231, A144232, A144233, A144234, A144236.
%K A144242 nonn
%O A144242 1,1
%A A144242 _Reikku Kulon_, Sep 15 2008
%E A144242 a(8) from _Amiram Eldar_, Jul 24 2025