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 A247961 #20 Sep 08 2022 08:46:10 %S A247961 0,1,2,3,4,38,40,104,114,135,417,1251,14786,16720,43831,152659 %N A247961 Numbers n such that 45^n + 2 is prime. %C A247961 Terms of A016969 and A113770 (except 1) are not in the sequence. - _Bruno Berselli_, Oct 02 2014 %C A247961 a(17) > 2*10^5. - _Robert Price_, Sep 15 2015 %H A247961 Henri & Renaud Lifchitz, <a href="http://www.primenumbers.net/prptop/searchform.php?form=45%5En%2B2&action=Search">PRP Top Records, Search for 45^n + 2</a>. %p A247961 A247961:=n->`if`(isprime(45^n+2),n,NULL): seq(A247961(n),n=1..500); # _Wesley Ivan Hurt_, Oct 02 2014 %t A247961 Select[Range[0, 2000], PrimeQ[45^# + 2] &] %o A247961 (Magma) [n: n in [0..400]| IsPrime( 45^n + 2 )]; %o A247961 (PARI) is(n)=ispseudoprime(45^n+2) \\ _Charles R Greathouse IV_, Jun 06 2017 %Y A247961 Cf. similar sequences listed in A247957. %K A247961 nonn,more %O A247961 1,3 %A A247961 _Vincenzo Librandi_, Oct 02 2014 %E A247961 a(13)-a(16) from _Robert Price_, Sep 15 2015