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 A141797 #57 Oct 17 2020 02:36:26 %S A141797 0,47,5991,147459 %N A141797 Numbers n such that 2*17^n + 1 is prime. %C A141797 Primes found and proved by PrimeForm. No more terms up to 20000. %C A141797 a(5) > 2*10^5. - _Robert Price_, Jan 10 2016 %C A141797 a(5) > 10^6. - _Paul S. Vanderveen_, Oct 16 2020 %o A141797 (PARI) is(n) = ispseudoprime(2*17^n + 1); \\ _Altug Alkan_, Jan 10 2016 %Y A141797 Cf. A141774, A141798. %K A141797 nonn,bref,hard,more %O A141797 1,2 %A A141797 _Rick L. Shepherd_, Jul 04 2008 %E A141797 a(4) from _Robert Price_, Jan 10 2016