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 A244388 #9 Sep 08 2022 08:46:08 %S A244388 4,6,60,208,250,282,294,384,400,502,760,942,1032,1050,1390,1560,2028, %T A244388 2038,2124,2182,3196,4246,4426,4522,4932,4986,5020,5092,5830,6216, %U A244388 6634,6868,7128,7156,7182,7240,7356,7428,7642,7858,8188,8454,8500,8670,9130 %N A244388 Numbers k such that 1 + k + k^3 + k^5 + k^7 + k^9 + ... + k^49 is prime. %H A244388 Vincenzo Librandi, <a href="/A244388/b244388.txt">Table of n, a(n) for n = 1..490</a> %t A244388 Select[Range[10000], PrimeQ[Total[#^Range[1, 49, 2]] + 1] &] %o A244388 (Magma) [n: n in [0..10000] | IsPrime(s) where s is 1+&+[n^i: i in [1..49 by 2]]]; %Y A244388 Cf. similar sequences listed in A244376. %K A244388 nonn,easy %O A244388 1,1 %A A244388 _Vincenzo Librandi_, Jun 27 2014