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 A289725 #19 Jun 17 2025 02:59:30
%S A289725 2161,59023,1594297,31381059583,7625597484961,205891132094623,
%T A289725 1570042899082081611640534537,381520424476945831628649898783,
%U A289725 66555937033867822607895549241096482953017615834735226137
%N A289725 Primes of the form 3^k - 26.
%H A289725 Robert Price, <a href="/A289725/b289725.txt">Table of n, a(n) for n = 1..10</a>
%H A289725 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 A289725 Henri and Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop">PRP Records</a>
%H A289725 OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>
%F A289725 a(n) = 3^A219045(n) - 26. - _Elmo R. Oliveira_, Nov 12 2023
%t A289725 Select[Table[3^k - 26, {k, 3, 100}], PrimeQ[#] &]
%Y A289725 Cf. A000040, A219045 (corresponding k's).
%K A289725 nonn
%O A289725 1,1
%A A289725 _Robert Price_, Sep 02 2017