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 A273521 #15 Feb 16 2025 08:33:35 %S A273521 1,105,209,505,683,879,1233,11647 %N A273521 Numbers n such that 10*14^n-1 is prime. %H A273521 J. Brillhart, D. H. Lehmer and J. L. Selfridge, <a href="http://dx.doi.org/10.1090/S0025-5718-1975-0384673-1">New primality criteria and factorizations of 2^m+-1</a>, Math. Compl. 29 (1975) 620-647. %H A273521 John Eisenmann, <a href="http://ostracodfiles.com/primes14/primes.php">Prime Numbers of the Form a * 14^b - 1</a>. %H A273521 Victor Shoup, <a href="http://www.shoup.net/ntb/ntb-v2.pdf">A Computational Introduction to Number Theory and Algebra</a>, 2008, page 348. %H A273521 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/LucasSequence.html">Lucas Sequence</a>. %H A273521 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Rabin-MillerStrongPseudoprimeTest.html">Rabin-Miller Strong Pseudoprime Test</a>. %o A273521 (PARI) is(n)=ispseudoprime(10*14^n-1) \\ _Charles R Greathouse IV_, Jun 08 2016 %K A273521 nonn,more %O A273521 0,2 %A A273521 _Jack P. Eisenmann_, May 23 2016