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 A062577 #19 Jul 04 2021 07:52:01 %S A062577 3,5,19,311,317,1129,4253,7699,18199,35153,206081 %N A062577 Numbers k such that 11^k - 10^k is prime. %C A062577 Terms greater than 1000 may correspond to unproven strong pseudoprimes. %H A062577 <a href="http://www.primenumbers.net/prptop/searchform.php?form=11%5Ep-10%5Ep">Top probable primes of the form 11^p-10^p</a> %o A062577 (PARI) is(n)=ispseudoprime(11^n-10^n) \\ _Charles R Greathouse IV_, Feb 17 2017 %Y A062577 Cf. A000043, A057468, A059801, A059802, A062572-A062666. %K A062577 nonn,hard %O A062577 1,1 %A A062577 _Mike Oakes_, May 18 2001, May 19 2001 %E A062577 Two more terms 18199 and 35153 from _Jean-Louis Charton_, Sep 02 2009 %E A062577 New term 206081 found by _Jean-Louis Charton_ in October 2011 %E A062577 Edited by _M. F. Hasler_, Sep 16 2013