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 A102203 #12 Aug 15 2021 09:31:22 %S A102203 4,26,49,1651,44311,38141,45901,990681,8041777,60558487,8252802091, %T A102203 1348187591,11280376871,49455591538,1658081357516741, %U A102203 15268848817955861,6791980801494070261,8278821177559776598,759117158185214871379,47088657278621730593201,187491222710962870446779 %N A102203 Iccanobirt semiprimes (13 of 15): Semiprime numbers in A102123. %F A102203 a(n) = A102123(A102183(n)). %Y A102203 Cf. A001358, A102123, A102183, A102191-A102205. %K A102203 nonn,less,base %O A102203 1,1 %A A102203 _Jonathan Vos Post_ and _Ray Chandler_, Dec 31 2004 %E A102203 Offset changed to 1 and more terms from _Jinyuan Wang_, Aug 15 2021