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 A244380 #10 Sep 08 2022 08:46:08 %S A244380 48,136,172,198,222,388,718,802,844,966,1342,1356,1488,1542,1668,1708, %T A244380 1734,1780,1956,2008,2082,2316,2356,2394,2422,2536,2734,2844,2880, %U A244380 2916,2974,2982,3024,3120,3258,3364,3562,3664,3906,3930,4308,4312,4554,4566 %N A244380 Numbers k such that 1 + k + k^3 + k^5 + k^7 + k^9 + ... + k^25 is prime. %H A244380 Vincenzo Librandi, <a href="/A244380/b244380.txt">Table of n, a(n) for n = 1..700</a> %t A244380 Select[Range[6000], PrimeQ[Total[#^Range[1, 25, 2]] + 1] &] %o A244380 (Magma) [n: n in [0..5500] | IsPrime(s) where s is 1+&+[n^i: i in [1..25 by 2]]]; %Y A244380 Cf. similar sequences listed in A244376. %K A244380 nonn,easy %O A244380 1,1 %A A244380 _Vincenzo Librandi_, Jun 27 2014