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 A220787 #31 Sep 19 2024 11:53:48 %S A220787 1,15,18,167,684,698,1642,3691,4245,5370,6238,6926,9646,10656,10999, %T A220787 11868,14188,35787 %N A220787 Numbers k such that k^11 + 11*k + 11^k is prime. %C A220787 a(13) > 9000. - _Tyler NeSmith_, Jul 26 2021 %t A220787 Select[Range[5000], PrimeQ[#^11 + 11*# + 11^#]&] %o A220787 (PARI) is(n)=ispseudoprime(n^11+11*n+11^n) \\ _Charles R Greathouse IV_, Jun 06 2017 %Y A220787 Cf. A220653. %K A220787 nonn,more %O A220787 1,2 %A A220787 _Vincenzo Librandi_, Jan 07 2013 %E A220787 a(10)-a(12) from _Tyler NeSmith_, Jul 26 2021 %E A220787 a(13)-a(15) from _Michael S. Branicky_, Jan 13 2023 %E A220787 a(16)-a(17) from _Michael S. Branicky_, Apr 22 2023 %E A220787 a(18) from _Michael S. Branicky_, Sep 19 2024