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 A171514 #27 Jun 30 2024 11:21:33 %S A171514 1,3,6,9,13,17,29,63,90,531,14286,30617,37815 %N A171514 Numbers k such that 1 + 8*10^k + 100^k is prime. %C A171514 No more terms up to k = 7500. %C A171514 14286, 30617, and 37815, found by Daniel Heuer in 2001-2002, are also terms; see Caldwell link. - _Jeppe Stig Nielsen_, Jan 30 2022 %H A171514 Chris K. Caldwell, <a href="https://primes.utm.edu/primes/search.php?Description=%5E10%5E%25%2B8*10%5E%25%2B1&OnList=all&Number=20&Style=HTML">Prime Pages, Database Search Output</a> %t A171514 Select[Range[1000], PrimeQ[1 + 8 10^# + 100^# ] &] (* _Vincenzo Librandi_, Apr 26 2014 *) %o A171514 (PARI) is(n)=ispseudoprime(1+8*10^n+100^n) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A171514 Cf. A171376, A171411, A171459, A171554. %K A171514 more,hard,nonn %O A171514 1,2 %A A171514 _Jason Earls_, Dec 10 2009 %E A171514 a(11)-a(13) from _Lucas A. Brown_, Mar 04 2024