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 A102174 #18 Aug 11 2021 01:25:36
%S A102174 5,11,18,33,35,37,43,44,56,63,93,148,175,176,204,288,317
%N A102174 Iccanobirt semiprime indices (4 of 15): Indices of semiprime numbers in A102114.
%F A102174 A102114(a(n)) = A102194(n).
%t A102174 nxt[{a_,b_,c_}]:={b,c,IntegerReverse[c]+b+a};Flatten[Position[ NestList[ nxt,{0,0,1},200][[All,1]],_?(PrimeOmega[#]==2&)]]-1 (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, May 16 2018 *)
%Y A102174 Cf. A001358, A102114, A102171-A102185, A102194.
%K A102174 nonn,more,less,base
%O A102174 1,1
%A A102174 _Jonathan Vos Post_ and _Ray Chandler_, Dec 31 2004
%E A102174 a(15) from _Robert Price_, Nov 08 2018
%E A102174 Offset changed to 1 and a(16)-a(17) from _Jinyuan Wang_, Aug 10 2021