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 A215446 #22 Jun 01 2025 15:07:43 %S A215446 1,7,27,43,87,223,11589 %N A215446 Numbers k such that 11^k + k^11 - 1 is prime. %C A215446 a(8) > 2*10^5. - _Robert Price_, Nov 08 2014 %t A215446 Select[Range[0, 5000], PrimeQ[11^# + #^11 - 1] &] %o A215446 (Magma) [k: k in [0..2000] | IsPrime(11^k + k^11 - 1)]; %o A215446 (PARI) is(n)=isprime(11^n+n^11-1) \\ _Charles R Greathouse IV_, Feb 17 2017 %K A215446 nonn,hard,more %O A215446 1,2 %A A215446 _Vincenzo Librandi_, Sep 06 2012 %E A215446 a(7) from _Robert Price_, Mar 15 2014