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 A135437 #15 Jul 08 2019 02:02:27
%S A135437 563,1103,2467,2819,6599,29339,41039,52631,62743,172079,188459,278543,
%T A135437 340559,488879,656599,656603,670031,1033667,1909003,2100899,3146219,
%U A135437 5048999,6049679,8719307,10024559,10402559,10877579,11119103,12261059,14913989,15247619
%N A135437 Primes with a twin Carmichael number: primes p such that p-2 or p+2 are Carmichael numbers.
%H A135437 Amiram Eldar, <a href="/A135437/b135437.txt">Table of n, a(n) for n = 1..10000</a> (terms 1..1878 from Pierre CAMI)
%e A135437 563 is in the sequence since it is a prime number, and 563 - 2 = 561 is a Carmichael number.
%e A135437 1103 is in the sequence since it is a prime number, and 1103 + 2 = 1105 is a Carmichael number.
%t A135437 s = {}; carmichaelQ[n_] := CompositeQ[n] && Divisible[n - 1, CarmichaelLambda[n]]; Do[If[carmichaelQ[n], If[PrimeQ[n - 2], AppendTo[s, n - 2]]; If[PrimeQ[n + 2], AppendTo[s, n + 2]]], {n, 10^6}]; s (* _Amiram Eldar_, Jul 07 2019 *)
%Y A135437 Cf. A002997, A287591.
%K A135437 nonn
%O A135437 1,1
%A A135437 _Pierre CAMI_, Dec 14 2007, corrected Jun 22 2008; Sep 17 2008