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 A059454 #28 Jul 28 2024 10:59:07
%S A059454 2,3,5,6,9,14,39,51,73,101,155,183,286,291,310,313,335,570,951,1011,
%T A059454 1183,1930,2586,3423,6486,7791,11586,14290,18590,29595,35286,76311
%N A059454 Numbers k such that 2*3^k - 7 is prime.
%t A059454 Do[ If[ PrimeQ[ 2*3^n - 7 ], Print[n] ], {n, 1, 5700} ]
%o A059454 (PARI) is(n)=ispseudoprime(2*3^n-7) \\ _Charles R Greathouse IV_, May 22 2017
%o A059454 (Magma) [n: n in [1..1000] | IsPrime(2*3^n-7)]; // _Jinyuan Wang_, Jan 20 2020
%Y A059454 Cf. A059326 (2*3^k + 7 is prime).
%K A059454 nonn,more
%O A059454 1,1
%A A059454 _Robert G. Wilson v_, Feb 15 2001
%E A059454 First term 0 removed by _Georg Fischer_, Aug 01 2019
%E A059454 a(27)-a(30) from _Jinyuan Wang_, Jan 20 2020
%E A059454 a(31) from _Michael S. Branicky_, May 20 2023
%E A059454 a(32) from _Michael S. Branicky_, Jul 28 2024