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 A290007 #12 Jun 17 2025 02:59:53
%S A290007 19,619,3119,15619,9765619,11102230246251565404236316680908203119,
%T A290007 132348898008484427979425390731194056570529937744140619,
%U A290007 2067951531382569187178521730174907133914530277252197265619,32311742677852643549664402033982923967414535582065582275390619
%N A290007 Prime numbers of the form 5^k - 6.
%H A290007 Robert Price, <a href="/A290007/b290007.txt">Table of n, a(n) for n = 1..11</a>
%H A290007 F. Firoozbakht, 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 A290007 Henri & Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop">PRP Records</a>
%H A290007 OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>
%t A290007 Select[Table[5^k - 6, {k, 2, 100}], PrimeQ[#] &]
%Y A290007 Cf. A165701.
%K A290007 nonn
%O A290007 1,1
%A A290007 _Robert Price_, Sep 03 2017