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 A241861 #40 Sep 08 2022 08:46:07
%S A241861 2,5,188286357631,15018933029959449607893431916515023,
%T A241861 1643356469972045002664087635582629208716484341598400533
%N A241861 Primes of the form 2*3^k - k.
%C A241861 Generated by k = 0, 1, 23, 71, 113,.. - _Michel Marcus_, May 11 2014
%C A241861 No other terms for k < 100000. - _Jens Kruse Andersen_, May 19 2014
%e A241861 2 is in this sequence because 2*3^0 - 0 = 2.
%t A241861 Select[Table[2 3^n - n, {n, 0, 300}], PrimeQ] (* _Vincenzo Librandi_, Oct 21 2014 *)
%o A241861 (Magma) [a: n in [0..150] | IsPrime(a) where a is 2*3^n - n]; // _Juri-Stepan Gerasimov_, Apr 30 2014
%K A241861 nonn
%O A241861 1,1
%A A241861 _Juri-Stepan Gerasimov_, Apr 30 2014