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 A220703 #15 Oct 27 2024 13:03:14 %S A220703 2,3,17,74,120,212,528,2348,13820,41268 %N A220703 Numbers k such that k^7 + 7*k + 7^k is prime. %t A220703 Select[Range[5000], PrimeQ[#^7 + 7*# + 7^#]&] %o A220703 (PARI) is(n)=ispseudoprime(n^7+7*n+7^n) \\ _Charles R Greathouse IV_, Jun 13 2017 %Y A220703 Cf. A220528. %K A220703 nonn,more %O A220703 1,1 %A A220703 _Vincenzo Librandi_, Jan 07 2013 %E A220703 a(9) from _Michael S. Branicky_, Jul 13 2023 %E A220703 a(10) from _Michael S. Branicky_, Oct 27 2024