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 A173083 #3 Mar 31 2012 12:38:28
%S A173083 6,226,262,302,314,334,346,382,466,482,514,538,562,734,778,842,866,
%T A173083 886,898,926,974,1006,1046,1282,1306,1318,1322,1438,1466,1478,1574,
%U A173083 1622,1774,1822,1838,1858,1894,1994,2302,2342,2446,2518,2578,2582,2602,2638
%N A173083 Semiprimes q such that q^2+3 and q^2-3 are also semiprimes.
%F A173083 {A001358(j): A074985(j)-3 in A001358 and A074985(j)+3 in A001358}. [R. J. Mathar, Mar 11 2010]
%e A173083 6^2-3=33 = 3*11 and 6^2+3=39 = 3*13 are semiprimes derived from q=6, so q=6 is in the sequence.
%t A173083 f[n_]:=Last/@FactorInteger[n]=={1,1}||Last/@FactorInteger[n]=={2}; lst={}; Do[If[f[n], a=n^2-3;b=n^2+3;If[f[a]&&f[b],AppendTo[lst,n]]],{n,8!}]; lst
%Y A173083 Cf. A001358, A173082
%K A173083 nonn
%O A173083 1,1
%A A173083 _Vladimir Joseph Stephan Orlovsky_, Feb 09 2010
%E A173083 Definition rephrased - _R. J. Mathar_, Mar 11 2010