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 A125883 #15 Mar 18 2020 07:28:58
%S A125883 2,4,7,9,11,13,16,17,18,26,27,29,31,33,34,38,39,40,43,47,50,57,59,65,
%T A125883 69,70,76,81,89,90,92,93,95,103,107,109,126,128,129,138,140,148,162,
%U A125883 167,179,182,183,192,197,206,209,211,221,223,226,228,229,230,234,240
%N A125883 Numbers k for which k^5+k^4-1 is prime.
%H A125883 Amiram Eldar, <a href="/A125883/b125883.txt">Table of n, a(n) for n = 1..10000</a>
%t A125883 Do[If[PrimeQ[x^5 + x^4 - 1], Print[x]], {x, 1, 200}]
%t A125883 Select[Range[200],PrimeQ[#^5+#^4-1]&] (* _Harvey P. Dale_, Apr 10 2018 *)
%o A125883 (PARI) is(n)=isprime(n^5+n^4-1) \\ _Charles R Greathouse IV_, May 15 2013
%Y A125883 Cf. A000040, A045546, A125881, A125882, A125884, A125885.
%K A125883 nonn
%O A125883 1,1
%A A125883 _Artur Jasinski_, Dec 14 2006
%E A125883 More terms from _Amiram Eldar_, Mar 18 2020