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 A128455 #14 Jun 11 2021 08:40:26
%S A128455 1,2,3,11,45,51,260,324,390,393,1112,3092,4445,10373,15861,18528,
%T A128455 97715,112961
%N A128455 Numbers k such that 9^k - 2 is a prime.
%C A128455 a(19) > 2*10^5. - _Robert Price_, Aug 18 2014
%t A128455 Do[ f = 9^n - 2; If[ PrimeQ[ f ], Print[ {n, f} ] ], {n,1,1000} ]
%Y A128455 Cf. A084714 (smallest prime of the form (2n-1)^k - 2).
%Y A128455 Cf. A128472 (smallest prime of the form (2n-1)^k - 2 for k>(2n-1)).
%Y A128455 Cf. A014224, A109080, A090669, A128457, A128458, A128459, A128460, A128461.
%K A128455 nonn,hard,more
%O A128455 1,2
%A A128455 _Alexander Adamchuk_, Mar 14 2007
%E A128455 1112 from _Stefan Steinerberger_, May 05 2007
%E A128455 More terms from _Ryan Propper_, Jan 12 2008
%E A128455 a(15)-a(18) from _Robert Price_, Aug 18 2014