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 A190942 #35 Apr 03 2023 10:36:12 %S A190942 0,3,29,83,153,327,753,879,3333,36977 %N A190942 Numbers n such that 2*71^n + 1 is prime. %C A190942 a(11) > 10^5. - _Robert Price_, Jan 12 2016 %H A190942 Chris K. Caldwell, The List of Largest Known Primes, <a href="https://t5k.org/primes/page.php?id=38525">2 * 71^879 + 1</a> %H A190942 Chris K. Caldwell, The List of Largest Known Primes, <a href="https://t5k.org/primes/page.php?id=22444">2 * 71^3333 + 1</a> %H A190942 Chris K. Caldwell, The List of Largest Known Primes, <a href="https://t5k.org/primes/page.php?id=67168">2 * 71^36977 + 1</a> %t A190942 Select[Range[0, 10^3], PrimeQ[2*71^# + 1] &] (* _Arkadiusz Wesolowski_, Jul 29 2011 *) %o A190942 (Magma) [n : n in [0..10^3] | IsPrime(2*71^n+1)]; // _Arkadiusz Wesolowski_, Jul 29 2011 %o A190942 (PARI) for(n=0, 10^3, if(isprime(2*71^n+1), print1(n, ", "))) \\ _Arkadiusz Wesolowski_, Jul 29 2011 %Y A190942 Cf. A141774, A141798. %K A190942 nonn,hard,more %O A190942 1,2 %A A190942 _Arkadiusz Wesolowski_, May 24 2011