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 A300976 #24 Jul 09 2018 17:30:37 %S A300976 4,104,124,728 %N A300976 Numbers k such that k^k - 5 is a prime. %C A300976 728^728 - 5 is a probable prime. %C A300976 Next term, if it exists, is greater than 5000. - _Vaclav Kotesovec_, Mar 25 2018 %C A300976 Next term, if it exists, is greater than 31000. - _Robert Price_, Mar 26 2018 %t A300976 Select[Range[1000], PrimeQ[#^# - 5] &] (* _Vaclav Kotesovec_, Mar 25 2018 *) %o A300976 (PARI) isok(k) = ispseudoprime(k^k - 5); \\ _Altug Alkan_, Mar 17 2018 %Y A300976 Numbers k such that k^k + b is a prime: A300981 (b=-10), this sequence (b=-5), A100408 (b=-2), A100407 (b=2), A166852 (b=3), A100837 (b=4), A100838 (b=7), A300292 (b=9), A100839 (b=10), A173974 (b=43). %K A300976 nonn,hard,more %O A300976 1,1 %A A300976 _Seiichi Manyama_, Mar 17 2018