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 A099482 #17 Jul 08 2023 15:23:14
%S A099482 1927,8023,32543,2096711,8388079,137438952103,549755812367,
%T A099482 2199023253871,8796093020359,140737488353119,562949953418911,
%U A099482 36028797018960943,147573952589676408439,37778931862957161703943
%N A099482 Semiprimes of the form 2^k - k^2.
%H A099482 Hugo Pfoertner, <a href="/A099482/b099482.txt">Table of n, a(n) for n = 1..36</a>
%H A099482 Dario Alpern, <a href="https://www.alpertron.com.ar/ECM.HTM">Factorization using the Elliptic Curve Method.</a>
%e A099482 a(2) = 8023 because 8023 = 71*113 = 2^13 - 13^2 = 2^A099481(2) - A099481(2)^2.
%t A099482 Select[Table[2^n - n^2, {n, 100}], PrimeOmega[#] == 2&] (* _Vincenzo Librandi_, Sep 21 2012 *)
%Y A099482 Cf. A024012 2^n-n^2, A099481 2^k-k^2 is a semiprime, A072180 2^k-k^2 is prime, A075896 primes of the form 2^k-k^2.
%K A099482 nonn
%O A099482 1,1
%A A099482 _Hugo Pfoertner_, Oct 18 2004