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 A144232 #12 Jul 24 2025 03:25:55
%S A144232 7,13,19,61,67,1021,4093,4099,16381,65539,262147,1048573,4194301,
%T A144232 16777213,268435459,1073741827,19342813113834066795298819,
%U A144232 19807040628566084398385987581,83076749736557242056487941267521533,5316911983139663491615228241121378301,1427247692705959881058285969449495136382746621
%N A144232 Prime numbers of the form 4^k +- 3.
%H A144232 Amiram Eldar, <a href="/A144232/b144232.txt">Table of n, a(n) for n = 1..35</a>
%t A144232 Select[Flatten[Table[4^n+{3,-3},{n,100}]],PrimeQ]//Union (* _Harvey P. Dale_, Nov 13 2020 *)
%Y A144232 Subset of A122834.
%Y A144232 Cf. A000040, A000668, A144231.
%K A144232 nonn
%O A144232 1,1
%A A144232 _Reikku Kulon_, Sep 15 2008
%E A144232 a(20)-a(21) from _Amiram Eldar_, Jul 24 2025