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 A125260 #19 Jul 14 2025 14:30:36
%S A125260 1,7,9,25,39,45,73,85,99,147,163,165,169,189,213,219,223,225,249,253,
%T A125260 259,279,333,337,385,433,457,465,469,477,499,595,639,643,655,703,709,
%U A125260 715,729,849,853,895,969,973,979,987,1065,1075,1077,1093,1165,1239,1255
%N A125260 Numbers k such that k^5 + 4 is prime.
%H A125260 Carmine Suriano, <a href="/A125260/b125260.txt">Table of n, a(n) for n = 1..4431</a>
%t A125260 lst={};k=5;Do[If[PrimeQ[n^k+k-1], AppendTo[lst, n]], {n, 10^3}];lst (* _Vladimir Joseph Stephan Orlovsky_, Sep 10 2008 *)
%t A125260 Select[Range[1300],PrimeQ[#^5+4]&] (* _Harvey P. Dale_, Oct 14 2019 *)
%o A125260 (PARI) is(n)=isprime(n^5+4) \\ _Charles R Greathouse IV_, Feb 17 2017
%Y A125260 Other sequences of the type "Numbers k such that k^j + j - 1 is prime": A000040 (j=1), A005574 (j=2), A067200 (j=3), A125259 (j=4), this sequence (j=5), A125261 (j=6), A125262 (j=7), A125263 (j=8), A125264 (j=10), A125265 (j=11)...
%K A125260 nonn
%O A125260 1,2
%A A125260 _Zak Seidov_, Nov 26 2006