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 A219616 #21 Oct 10 2024 01:10:25 %S A219616 2,4,6,8,24,28,36,54,92,154,234,442,1138,2408,58564 %N A219616 Numbers k such that 5^k + k^4 is prime. %t A219616 Select[Range[0, 10000, 2], PrimeQ[(5^# + #^4)] &] %o A219616 (Magma) /* The code gives only the terms up to 442: */ [n: n in [0..1000 by 2] | IsPrime(5^n + n^4)]; %o A219616 (PARI) is(n)=ispseudoprime(5^n+n^4) \\ _Charles R Greathouse IV_, Jul 01 2013 %Y A219616 Cf. A182359, A059802. %K A219616 nonn,more %O A219616 1,1 %A A219616 _Vincenzo Librandi_, Nov 26 2012 %E A219616 a(15) from _Michael S. Branicky_, Oct 09 2024