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 A127592 #12 Sep 08 2022 08:45:29
%S A127592 149,277,661,853,1109,1237,1301,1429,1493,1621,1877,2069,2389,2837,
%T A127592 3221,3413,3541,3733,3797,3989,4373,5077,5333,5653,5717,6037,6101,
%U A127592 6229,6421,6869,6997,7253,7573,7829,8597,9109,9173,9749,9941,10069,10133,10453
%N A127592 Primes of the form 64k+21.
%C A127592 All these primes are sums of two squares, also all indices are sums of two squares since we have the identity 64k+21 = 4(4(4k+1)+1)+1.
%H A127592 Vincenzo Librandi, <a href="/A127592/b127592.txt">Table of n, a(n) for n = 1..1000</a>
%t A127592 a = {}; Do[If[PrimeQ[21 + 64 n], AppendTo[a, 21 + 64 n]], {n, 0, 200}]; a
%t A127592 Select[Prime[Range[1700]], MemberQ[{21}, Mod[#, 64]] &] (* _Vincenzo Librandi_, Sep 06 2012 *)
%o A127592 (Magma) [p: p in PrimesUpTo(11000) | p mod 64 eq 21 ]; // _Vincenzo Librandi_, Sep 06 2012
%Y A127592 Cf. A000040. A035050, A007522, A127575, A127576, A127577, A127578, A127580, A127581, A087522, A127586, A127587, A127589, A127590, A127591, A127593, A127594.
%K A127592 nonn,easy
%O A127592 1,1
%A A127592 _Artur Jasinski_, Jan 19 2007, Nov 12 2007