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 A089535 #20 Oct 26 2024 10:45:45
%S A089535 6,2059,8388631,17179869218,576460752303423547,590295810358705651781,
%T A089535 154742504910672534362390615,39614081257132168796771975263,
%U A089535 664613997892457936451903530140172407,10633823966279326983230456482242756731,680564733841876926926749214863536423041
%N A089535 Semiprimes of the form 2^k + k.
%H A089535 Amiram Eldar, <a href="/A089535/b089535.txt">Table of n, a(n) for n = 1..26</a>
%F A089535 a(n) = 2^A085745(n) + A085745(n).
%t A089535 Select[Table[2^k+k,{k,200}],PrimeOmega[#]==2&] (* _Harvey P. Dale_, Aug 11 2024 *)
%Y A089535 Intersection of A001358 and A006127.
%Y A089535 Cf. A085745, A089536, A089537, 129962.
%K A089535 nonn
%O A089535 1,1
%A A089535 _Ray Chandler_, Nov 08 2003
%E A089535 a(10)-a(11) from _Jinyuan Wang_, Jul 30 2021