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 A108403 #17 Sep 08 2022 08:45:19
%S A108403 5,25,65,145,355,605,985,1075,1295,1465,1565,1675,1915,2345,2425,2585,
%T A108403 2755,3005,3155,3785,4595,4625,4975,5225,5465,5665,5905,5915,6115,
%U A108403 6295,6305,6415,6485,7235,7775,8185,9065,9275,9415,9755,9835,10145,10195
%N A108403 Numbers n such that n^2-6 and n^2+6 are both prime.
%C A108403 All members of the sequence are divisible by 5 as if n is 1 or 4 mod 5 then n^2-6 is divisible by 5 and if n is 2 or 3 mod 5 then n^2+6 is divisible by 5.
%H A108403 Harvey P. Dale, <a href="/A108403/b108403.txt">Table of n, a(n) for n = 1..1000</a>
%e A108403 a(2)=25 since 25^2 - 6 = 619 and 25^2 + 6 = 631 are both prime.
%t A108403 pQ[n_]:=Module[{n2=n^2},And@@PrimeQ[{n2-6,n2+6}]]; Select[5Range[2100], pQ] (* _Harvey P. Dale_, Nov 06 2011 *)
%o A108403 (Magma) [n: n in [2..100000] | IsPrime(n^2-6) and IsPrime(n^2+6)] // _Vincenzo Librandi_, Nov 13 2010
%Y A108403 Cf. A087681 (with n instead of n^2), A108701 (with 2 instead of 6).
%K A108403 nonn
%O A108403 1,1
%A A108403 _John L. Drost_, Jul 04 2005