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 A192261 #31 Jun 24 2023 12:32:58
%S A192261 1,25,45,78,88,93,189,199,232,2575,2625,2650,3105,3180,3205,3585,3685,
%T A192261 4015,4090,4140,4165,4545,4620,7753,7878,8383,8763,8788,8838,8938,
%U A192261 9318,9393,9823,17829,17979,18259,18309,18409,18889,19344,19369,19494,19849,19924
%N A192261 Numbers n such that 4n+1 is a palindromic prime.
%H A192261 Chai Wah Wu, <a href="/A192261/b192261.txt">Table of n, a(n) for n = 1..10000</a>
%H A192261 Wikipedia, <a href="http://en.wikipedia.org/wiki/Pythagorean_prime">Pythagorean primes</a>
%F A192261 {n such that A016813(n) is in A002385}. [_Jonathan Vos Post_, Jul 17 2011]
%t A192261 Select[Range[10000],PrimeQ[4#+1]&&PalindromeQ[4#+1]&] (* _Harvey P. Dale_, Jun 24 2023 *)
%o A192261 (PARI) is(n)=n==eval(concat(Vecrev(Str(n))))&&isprime(n);
%o A192261 for(n=1, 1e4, if(is(4*n+1), print1(n, ", "))) \\ _Altug Alkan_, Nov 04 2015
%Y A192261 Cf. A002385, A002144, A081220.
%K A192261 nonn,base
%O A192261 1,2
%A A192261 _Matevz Markovic_, Jul 02 2011
%E A192261 Prior Mathematica program removed and more terms from _Harvey P. Dale_, Jun 24 2023