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 A062574 #29 Jul 04 2021 07:52:16 %S A062574 7,11,17,29,31,79,113,131,139,4357,44029,76213,83663,173687,336419, %T A062574 615997 %N A062574 Numbers k such that 8^k - 7^k is prime or a strong pseudoprime. %C A062574 All terms are prime. - _Alexander Adamchuk_, Apr 27 2008 %H A062574 Henri & Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=8%5Ex-7%5Ex&action=Search">PRP Records</a>. %t A062574 Select[Range[200], PrimeQ[8^# - 7^#] &] (* _Vladimir Joseph Stephan Orlovsky_, Feb 22 2012 *) %o A062574 (PARI) is(n)=ispseudoprime(8^n-7^n) \\ _Charles R Greathouse IV_, Sep 04 2013 %Y A062574 Cf. A000043, A057468, A059801, A059802, A059803 (9^n-8^n is prime), A062572-A062666. %Y A062574 Cf. A016177 = 8^n - 7^n. %K A062574 nonn,hard %O A062574 1,1 %A A062574 _Mike Oakes_, May 18 2001, May 19 2001 %E A062574 Two more terms 44029 and 76213 found by Ananda Tallur & _Jean-Louis Charton_ in 2003. %E A062574 Three more terms 83663, 173687 and 336419 found by _Jean-Louis Charton_ in 2004 and 2008 %E A062574 New term 615997 found by Jean-Louis Charton corresponding to a probable prime with 556301 digits. _Jean-Louis Charton_, Sep 02 2009