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 A356764 #39 Aug 07 2025 16:48:15
%S A356764 4,3,3,3,3,3,3,5,5,5,5,5,5,7,7,7,7
%N A356764 Semiprimes divisible by their indices in the sequence of semiprimes, divided by those indices.
%C A356764 Except for a(1) = 4, all terms are prime.
%H A356764 Lucas A. Brown, <a href="https://github.com/lucasaugustus/oeis/blob/main/semiprimemods.py">semiprimemods.py</a>
%F A356764 a(n) = A357741(n) / A106125(n).
%t A356764 With[{sp=Select[Range[5*10^6],PrimeOmega[#]==2&]},Select[#[[1]]/#[[2]]&/@Thread[{sp,Range[Length[sp]]}],IntegerQ]] (* The program generates the first 13 terms of the sequence. *) (* _Harvey P. Dale_, Aug 07 2025 *)
%Y A356764 Cf. A001358, A106125, A357741.
%K A356764 nonn,hard,more
%O A356764 1,1
%A A356764 _Lucas A. Brown_, Oct 13 2022