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 A291860 #10 Jun 17 2025 09:23:47
%S A291860 41,2393,5764793,282475241,
%T A291860 1798465042647412146620280340569649349251241,
%U A291860 380532926880843152923706465386871407580539099147930273794471851842901108534824949331057641
%N A291860 Prime numbers of the form 7^k - 8.
%H A291860 Robert Price, <a href="/A291860/b291860.txt">Table of n, a(n) for n = 1..7</a>
%H A291860 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 A291860 Henri & Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop">PRP Records</a>
%H A291860 OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>
%t A291860 Select[Table[7^k - 8, {k, 2, 100}], PrimeQ[#] &]
%Y A291860 Cf. A217131.
%K A291860 nonn
%O A291860 1,1
%A A291860 _Robert Price_, Sep 04 2017