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 A291862 #13 Jun 17 2025 09:23:07
%S A291862 13,19,61,40353619,
%T A291862 59768263894155949306790119265585619217025149412430681661,
%U A291862 3945286644626550630858717985746264080026751644458455916464504975630931364915053228398031941487628933218072924433889392982611734440563298413
%N A291862 Primes of the form 7^k + 12.
%H A291862 Robert Price, <a href="/A291862/b291862.txt">Table of n, a(n) for n = 1..8</a>
%H A291862 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 A291862 Henri & Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop">PRP Records</a>
%H A291862 OpenPFGW Project, <a href="http://sourceforge.net/projects/openpfgw/">Primality Tester</a>
%t A291862 Select[Table[7^k+12, {k, 0, 100}], PrimeQ[#] &]
%Y A291862 Cf. A152213.
%K A291862 nonn
%O A291862 1,1
%A A291862 _Robert Price_, Sep 04 2017