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 A220701 #16 Oct 25 2024 14:35:43 %S A220701 1,2,4,5,7,17,22,47,155,167,203,277,469,629,890,1427,4507,5705,6095, %T A220701 9808,10108,12797,16184,31535,33575 %N A220701 Numbers k such that k^3 + 3*k + 3^k is prime. %C A220701 a(26) > 10^5. - _Michael S. Branicky_, Oct 25 2024 %t A220701 Select[Range[10000], PrimeQ[#^3 + 3*# + 3^#]&] %o A220701 (PARI) is(n)=ispseudoprime(n^3+3*n+3^n) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A220701 Cf. A220509. %K A220701 nonn,more %O A220701 1,2 %A A220701 _Vincenzo Librandi_, Jan 07 2013 %E A220701 a(21)-a(25) from _Michael S. Branicky_, Jul 13 2023