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 A289984 #15 Jun 17 2025 03:00:07
%S A289984 47,2153,177113,1594289,68630377364849,1853020188851807,
%T A289984 150094635296999087,984770902183611232847,
%U A289984 49269609804781974438694403402127765833,809164816771822689786320611221860560835816670552324143733808294394923420529
%N A289984 Primes of the form 3^k - 34.
%H A289984 Robert Price, <a href="/A289984/b289984.txt">Table of n, a(n) for n = 1..12</a>
%H A289984 F. Firoozbakht and M. F. Hasler, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL13/Hasler/hasler2.html">Variations on Euclid's formula for Perfect Numbers</a>, JIS 13 (2010) #10.3.1.
%H A289984 Henri and Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop">PRP Records</a>
%H A289984 OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>
%F A289984 a(n) = 3^A219051(n) - 34. - _Elmo R. Oliveira_, Nov 12 2023
%t A289984 Select[Table[3^k - 34, {k, 4, 100}], PrimeQ[#] &]
%Y A289984 Cf. A000040, A219051 (corresponding k's).
%K A289984 nonn
%O A289984 1,1
%A A289984 _Robert Price_, Sep 02 2017